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Early Positive Pregnancy Test: How Long After Implantation?

Pregnancy TestHow early after conception can pregnancy be detected with an early pregnancy test? And can the hCG pregnancy test before implantation become positive so that I know when to do a pregnancy test? How long after implantation can i take a pregnancy test and when can hCG be detected and how long after implantation can i take a pregnancy test?

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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.

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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1 Posts
By: little_tot On: Apr 9, 2013  4:57PM

hi, im a little confused and would like some advice please....i have been on cerezette for about a year now and it stopped my periods but i have recently been bleeding, however not as heavy as a normal period. i know i missed some of my pills in the last month and have had cramps, nausea, tiredness and some dizzy spells. i dont know if this is implantation bleeding and i am pregnant or not. as you can imagine my head is all over the place. i did do a hpt about a week ago but it was negative, although i could have tested too early as it was before i had vagonal bleeding 


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By: nex11 On: Feb 4, 2013  5:16AM

How about my case?

if my last period is oct 8, 2012 then the conception is oct 19(bf), 21(xbf), and 25(bf), what is the age of my preg. as of feb 4, 2013? it i posible to know the date of conception for that pregancy? or how to trce t


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By: TiffanyB89 On: Dec 5, 2012  9:48PM

Hi, I'm going through a similar situation. My fiancé and I had unprotected sex on November 13th it was 2 days after I ovulated and I started spotting like a brownish color on the 16th-19th. I took a HPT on Nov 23rd and again on the 27th and they were both negative. Am I testing too early? My period is due in 4 days should I wait after to test again? 


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2 Posts
By: Browneyedgirl On: Sep 5, 2012  11:59AM

If I got pregnant or fertilized on a thurs would a home urine test come up pos by Monday? Mine was positive, I had a blood test that showed my hcg was 33. Could I have gotten pregnant earlier then that thurs? 


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By: Browneyedgirl On: Sep 5, 2012  11:51AM

If I had sex on a Thursday and the following Monday came up with a positive urine test. Is that even possible it would show that soon? That's only 4-5 days? 


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By: Samantha Currey On: Aug 29, 2012  1:38PM

Hi, so I had what I believe to be implantation spotting on the 23rd accompanied by light mild cramps. I am now 6 days after that and two days before AF and I just tested and got a bfn on a hpt. Did I test too early?


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By: Annie_1986 On: Jun 22, 2012  4:28AM

I'm a bit confused. My husband and I have been ttc for a while, this month I feel different. I have sore boobs and have been feeling very tired. I have had some cramps on one side (different to period) as well as some spotting 11dpo, so I tested 13 dpo and it was negative. I was just wondering if I've tested too early and if I could still be pregnant. If so when should I test again? Grateful for any advice.  


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By: momoftwo On: Jun 3, 2012  4:25PM

Hello, I have a few conserns so anyone feel free to comment with your input.  My Miraina fell out on May 15th and i started to bleed on May 16th but for only 2 days. me and my hubbby had unprotected sex on the 19th of may around then. and again like every other day. I started my birth control pill  around a week after that. i a due to start my period in 7 days according to my pill pack.  1 week ago i took 3 pregnancy tests and all 3 were negative. Now heres the question. i have ALOT of pregnancy symptoms  so could i be pregnant or is it not likly?

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140 Posts
By: Dr.Amos On: May 9, 2012  4:42PM

This link here can help you identify when the pregnancy test is positive:

When is the pregnancy test positive based on your period

Amos Grunebaum, MD
New York, NY USA


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By: MandaMarie On: May 15, 2012  12:27AM

Thank you very much!

MandaMarie

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