How early can you do a pregnancy test and get the correct answer?

Question

I think i might be pregnant, but my periods not due for another week, and should i stop taking the pill? I missed some a couple of weeks back, buit started taking them again, but now i just feel odd.

Answer 1

How soon can I test? Well, first you gotta know how the test works. Briefly: the home pregnancy test (HPT) works by detecting a hormone called human chorionic gonadotropin (hCG.) When an egg is fertilized, it takes about 6 to 12 days to implant in the uterus, and then it begins to secrete hCG. It takes another day or two for enough hCG to build up and make its way into your pee. So, generally speaking, the earliest you can expect a positive HPT is 8 days past ovulation ("DPO") and the latest would be about 16 DPO. It is possible to get a positive test earlier or later, but not as common. In my experience, if you use a sensitive "early" test (anything that detects 25 mIU/mL of hCG or less) you can test around 12-14 DPO and feel reasonably secure with your results (the later you test, the more secure you can feel in its accuracy.)

If you do not chart or monitor your fertility in any way, and you think you may have conceived, you should wait 19 days (or longer) after having sex to test. Why 19?! Sperm can live approximately 5 days in the proper environment; if the sperm managed to live until you popped an egg, the actual conception could have taken place several days after the sex act that got the sperm there. To make sure you're not testing too early, assume the sperm had very long lives (5 days is considered a very long sperm life) and that conception occurred then. Then allow 14 days for the embryo to implant and develop enough hCG to show up on a pregnancy test (96% of pregnant women will test positive by then.)

Note: some HPT's say "test 5 days before your period is due!" or some such thing. Please note they are assuming a textbook 28-day cycle, with ovulation on Day 14. "5 days before your period is due" thus really "translates" to 10 DPO.

Essentially, you should remember that your high school biology textbook was WRONG. NOT all women have 28-day cycles and NOT all women ovulate on Day 14. For more info on this type of thing, see the Fertility Info section.

Here's an example. This is the textbook-perfect 28-day cycle with ovulation occurring on day 14 (in pink.) 10 DPO and later are reasonable days for testing (in green.) This is the cycle the HPT companies have in mind when they say "test 5 days before your period is due!"



Well, not everyone's body works this way. Here's another 28-day cycle-- but this one has ovulation occurring a little bit later, still well within the normal range. Watch what happens to your (green) testing opportunities!



All of a sudden, "5 days before your period is due!" is way too early for you to expect a positive test! (I tend to ovulate later myself, so by the time the "gold standard" of testing at 14 DPO is applicable, my period is already 3 days late! I needed to use an "early detection" test on the first day of my missed period. A "regular" test would probably have been negative-- even though my daughter is living proof that I was, indeed, pregnant ;)

Of course, it works in reverse, too. If you're an early ovulator, you're lucky! Check it out:



In this scenario, you could test even sooner than 5 days before your expected period.

Ultimately, it's important to remember that implantation is a variable thing. You may be able to detect a pregnancy very early on, but then again, you may not! If you can't, don't despair.

Answer 2

Go get blood work done and talk to you doctor. Its not good to take the pill while pregnant, it prevents the uterine lining from thickening and protecting the newly implanted ovum, plus the hormones are not good for a growing fetus.

A home pregnancy test only gives a good result after you're late. The new ones say you can test up to 5 days early, but the results are only 60% accurate.

You're close enough to your period to get a good reading on a blood test. Plus your doctor will be able to advise you on whether to stop the pill until you know for sure, or to continue as usual.

Answer 3

Depends if you looking to keep the baby if you are if so I would stop the pill but also stop intercourse till you find out. I would do a test a couple of days after your due day this way it will save you some money. If its negative next time be more careful. Good luck x

Answer 4

i think i may be pregnant too and my period is not due till next friday, i have bought some tests and they say i can do it a day after my first missed period, you can get ones that can tell you earlier, the only way i think you could get a correct answer before your period is due is by go to the drs and get a blood test done, i am seriosly thinking about having one done tomorrow.

Answer 5

They have pregnancy tests that can tell up to 4 days before Ur due period. or u can wait 2weeks after u last had unprotected sex

Answer 6

well with a good pregnancy test you can find out 4 days before your next period. you can still take the pill untill you know one way or the other.

Answer 7

A sensitive test can show pregnancy within a couple of days of conception - you do not have to wait until the date of your period.

Answer 8

I took an ept home pregnancy test at 4 weeks with my first baby, and it was positive. My second baby it was about 6 weeks.

Answer 9

i think you can do one 4 days after you have missed a period, i did mine the day after it was due and it was positive.

Answer 10

stop takin the pill just in case,i know there is a pregnancy kit you can use four days before your period is due,sorry i don't know the name but there is definitely one available!!good luck