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Early Positive Pregnancy Test: How Long After Implantation?

How early after conception and implantation can a pregnancy be detected with a positive pregnancy test?

If you are pregnant, then the urine home pregnancy test HPT can be positive as early as 10-11 days after ovulation and fertilization. That would be several days before the next menstrual period. The blood pregnancy hCG test is usually positive several days earlier. 

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An early positive pregnancy test  becomes positive only after the fertilized egg has first implanted into the uterus and then sent enough amounts of hCG, human chorionic gonadotropin, the pregnancy hormone, into your blood stream and from there into the urine.

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Implantation and a positive pregnancy test

Implantation, when the fertilized egg implants into the endometrium, happens about a week after ovulation (range: 6-12 days), and it takes another 3-4 days after implantation (9-16 dpo: days after ovulation) for the blood pregnancy test to first become positive, followed 2-3 days later by the early positive pregnancy urine test, the home pregnancy test (HPT).

  • Blood Pregnancy test: If you are pregnant then the blood pregnancy test is usually positive within 3-4 days after implantation or about 9-10 days after fertilization and ovulation.
  • Urine (Home HPT) Pregnancy Test: The early positive urine pregnancy test  will usually not become positive until 2-3 days after the blood test, and in most women until a missed period or about a week after implantation. Many manufacturers of urine pregnancy tests want you to believe that the urine test is usually positive before a missed period, but only about 25% of pregnant women will test positive with the HPT 2 days before a missed period, and about 40% the day before the missed period.

The wide variation of when the urine pregnancy test becomes positive and how early pregnancy can be detected are due to four variables which determine when the home urine pregnancy test becomes positive:

  1. Timing of Implantation
  2. Blood hCG Level
  3. Urine hCg Level
  4. Sensitivity of the Urine Test

1. Timing of Implantation

A pregnancy test detects the presence of the pregnancy hormone hCG (human chorionic gonadotropin) either in the blood or in the urine. The hCG in the urine comes from the hCG in the blood after it was filtered through the kidney. After ovulation, the egg gets fertilized and travels through the fallopian tube toward the uterus. This travel takes an average of a week. Implantation, the attachment of the fertilized egg in the lining of the uterus, occurs on average about a week or later after ovulation/fertilization, but it can happen as early as six days and as late as 12 days after fertilization/ovulation. At the time of implantation the placenta starts making the pregnancy hormone hCG, which then enters the blood stream. How early pregnancy can be detected depends on the pregnancy hormone hcG which can be detected in the blood about three to four days after implantation. Urine hCG can be detected about two to three days after blood hCG can first be seen. Detection of hCG depends on timing of implantation, so hCG can normally be detected in the blood between nine and 16 days after ovulation (HPT: 12-19 days after ovulation).

2. Blood hCG Level

 
There is a wide normal variation of hCG levels, both in the blood and the urine and this wide range changes the diagnosis of how early can pregnancy be detected. If a woman has low blood hCG levels, for example, then it can take several more days for it to show up on a pregnancy test.

3. Urine hCG Level

 
Urine hCG levels change over the course of the day depending on how much you drink and how diluted or concentrated the urine is. Urine pregnancy testing is best done with more concentrated urine. So how early can pregnancy be detected depends on the urine concentration and the quality of the early positive pregnancy test. If you drink a lot of fluid, the urine may be too diluted early on in pregnancy to achieve an hCG concentration adequate enough for a positive test.

4. Sensitivity of the Early Urine Home Pregnancy Test


Different pregnancy tests have different sensitivities and that has an impact on how early can pregnancy be detected. The lower the sensitivity, the earlier a pregnancy test becomes positive. Sensitivities are indicated in mIU/mL, the lowest amount of hCG in the urine that tests positive. A sensitivity of 20 mIU/mL requires one-half the hCG level to be positive when compared with a 40 mIU/mL sensitivity level, and it may become positive several days earlier than the pregnancy test with a higher sensitivity. Make sure you read the package of the pregnancy test to determine your pregnancy test's sensitivity.


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By: tiffx11 On: May 22, 2014  12:21AM

im not sure if anyone can relate to me but i have been taking fertilaid since may 9 taking 3 pills a day, my expected period is to come either the 28th or the 30th i started spotting today and its a very light pink it's never really been that light and i didnt expierence painful craps like i normally do before my menstral cycle ive just expierenced back pains headaches as well as nausia. Could i be expierencing my period a bit earlier or could this be implation bleeding?


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By: mariyam irfan On: May 17, 2014  1:15AM

Hi jazzy i had same thing like yours juat two months back everything was same like u explajned they did not find anything many ultrasounds they did they even said may b its ecotopic pregnancy in next ultrasound they said they can see like a dot point in my uterus so  its not ecotopic so i was happy atleast something is fine but exact day i started spotting wwent to emergency they said its fine no worries that spotting went to light bleeding went agagain to emergency they did my bloodtest to check my beta hcg level they were rising but not doubling every 48hrs they told me to go will check later after one week it was 8weeks pregnancy now i started having mild pain at night went to severe pain and bleeding heavily that i fainted and swetting went to the doctor my bb was high she admitted me and did ultrasound she said u had an incomplete misscarriage they gave me some medicines so all parts remaining can come out after medicines she did ultrasound still its there that parts she operated me that did my abortion.Hope everything is fine with u In Shaa Allah just telling u my experience and i am newly married just 4months now to marriage.


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By: jazzle On: Apr 19, 2014  5:56AM

i had my last period on March 5, 2014. i was quite hesitant to feel pregnant but it was already a week and my period did not come. we had a urine pregnancy test in April 10 and it was a weak positive which means a very light second line appeared on the test. we immediately went to the clinic and i had a blood pregnancy test ( qualitative ) and the result was also weak positive. on the next day April 11, i had a consultation with an OB GYNE and a quantitative blood pregnancy test was done ( beta HCG ) and my result was only 153. after 5 days April 16, i tested again for a urine HPT and the result was good because the second line appeared to become darker and more visible. on that day, i had a transvaginal ultrasound but no gestational sac was seen and i was very worried. if i will compute my age of gestation from my LMP i should be atleast 6 weeks pregnant but they can not see any evidence of intra uterine pregnancy. i am now so stressed. i am just thinking that i had a late ovulation and hoping to see my little angel sooner. please help me get through with this. thank you for reading this.


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By: ladybird12 On: May 14, 2014  6:18AM

Hi Jazzle, I was just wondering, what was your final result? Are you pregnant? I'm kind of in the same situation here, did urine test and there was a faint line. Consulted a doctor and did the test again, he said although the line was faint, but he confirmed that I am preganant. But when I consulted a specialist, and did the transvaginal ultrasound, no sac was detected. So according to the doc, it could just be a hormonal problem. I understand how stressed out you must have been, cause I'm in the same situation as you were now...


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By: Sgary09 On: Feb 17, 2014  12:13AM

 I came on my period January 27th and came off February 2nd. I started cramping a little February 15th and starting bleeding. A couple hours later it stopped but I was still mildly cramping. My blood was a very dark red brownish color. It keeps starting and stopping. I took a test the next day and it said negative. Is that true? Or did I take the test too soon?


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By: Sarah2014 On: Jan 30, 2014  8:13PM

Melinda: Did your pregnancy test ever came out positive, I'm in the exact situation and I was wondering if I too have any luck!! (: 


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By: Melinda123456789 On: Jan 10, 2014  4:08AM

I was told by my ob to go back to the clinic on the 27th no matter what the result of the PT would be. OR on the 2nd day of my menstruation if it will come within the span of time that she gave me to wait. I really want to get pregnant. Could you please give me some tips of when I could do the PT the earliest? We last had contact on the 6th of Jan 2014. Is it possible that my hormonal imbalance is back again?The time that I was given Provera to help me get my period was my first time to experience having no mense.I'm a little tired for the past few days, and I don't even understand the signs/symptoms of when a woman is pregnant in the internet. I can't rely that much. I'm not sure if I'm really experiencing them, or it's just psychological. I'd really appreciate any ideas or suggestions. 


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By: Sarah2014 On: Jan 30, 2014  8:15PM

Hi Melinda, I was wondering did your pregnancy test ever turned out positive? I'm in the exact situation, any luck?? (: 


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By: Melinda123456789 On: Jan 10, 2014  4:02AM

We found out that I have a right polycystic ovary (Sept 2013). Thank God, my left ovary is normal.I was told by my ob to take Provera for 5 days so that I could have my mense back (1st week of Oct 2013). I got my period, a day after the last tablet. I was bleeding after a week from the last day of my period and went back to my ob since it was my first time to experience it. I was given Iberet Folic so that I won't get anemic because of the bleeding and was told to come back to the clinic if the bleeding continues after 3 weeks. Fortunately, the bleeding didn't continue for more than 3weeks.I wasn't advised to take Provera again and had my normal mense the next month (Nov 26 2013). I was so happy to have my period back without taking anything.I haven't got my mense for the month of Dec 2013 and we had several unprotected contacts since Dec 2013 until the 1st week of Jan 2014. We do the pull-out method. I went to my ob this Jan 6 and was told to wait for three more weeks to have a PT done this 27th. I've done several PTs because I was thinking that I might be, it turned out that it I did the tests to early. I just did another PT yesterday and it's still negative. Every single day seems like forever. All the more that I have to wait until the 27th to make sure if I am or not.I don't want to have some problems again with my health, so I opted to wish that I am preggo.Is there a big possibility that I'm pregnant?Should after taking Provera for the first time won't correct my hormonal imbalance for the next few months?


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By: cari1985 On: Dec 23, 2013  4:39PM

Hi hi.Last week I thought I started my period. It was very faint...brown in color mixed with discharge and only appeared when I wiped. It started Wednesday afternoon and was gone by Friday evening. It didn't get heavier and no clots or actual blood like a normal period. So I assumed that it was implantation bleeding. My period is scheduled for Christmas day so it happened a week exactly before my period is due. I have no nausea, breast tenderness nor cramps or fatigue. Maybe more urination but that's it. I took a hpt on saturday and it was negative. I just took another one 10 minutes ago and negative again. Could I b testing too soon? Could I not be pregnant? What else could cause spotting? Any advice would be appreciated. I'm just a little concerned. Thanks a bunch everyone.

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