Do you wonder why you have a missed period but a negative pregnancy test? Could you still be pregnant?
You could be pregnant even though your pregnancy test is negative. It takes on average 14-16 days after ovulation and fertilization for the pregnancy test to turn positive. If you ovulated late and implantation happened late then it could take longer for the pregnancy test to become positive. If you still have no period, repeat the pregnancy test in a couple of days to see if you are pregnant or not.
- Testing too early, using a test with low sensitivity, or testing incorrectly.
- Not knowing if and when you ovulated, miscalculating your exact day of ovulation, the BIG O, and consequently miscalculating your next period (your period is supposed to come 12-16 days after ovulation).
- Not ovulating at all (anovulation).
When trying to get pregnant TTC it is important to chart your fertility and ovulation. Know exactly if and when you ovulated.
The average menstrual cycle is 28 days. If you are fortunate enough to have a regular 28 day cycle, then ovulation usually happens around cycle day 14-15. You would count 28 days from the start of your last menstrual cycle to determine when your next period is due. The problem with this method is two-fold. One, many women do not have a 28 day cycle and two, this does not account for variations in ovulation dates and more importantly the date of implantation.
Pregnancy tests and implantation
Another factor to consider is when implantation occurs. You will not get a positive urine pregnancy test until well after implantation occurs, about 5-6 days after implantation. Although hcg is produced almost from conception, it is not until the egg implants that the hcg can be released into the woman's blood stream in sufficient quantities to result in a positive pregnancy test. The time implantation occurs varies. Implantation can occur anywhere from 6-12 days past ovulation, and a urine pregnancy test will usually not become positive until 5-6 days after ovulation. Some women may notice slight spotting or bleeding, known as implantation bleeding, when the egg implants.
Other causes for a false negative pregnancy test include:
- Diluted urine
- Expired test
- Improper testing
- Ectopic pregnancy
If you have received a negative test result a day or two after your period is due, it may be as simple as testing too early or urine that was too diluted. If your period hasn't come, retest again in several days a week, and if still negative consult your doctor.