I know you are supposed to wait about two weeks for a home pregnancy test to become pretty reliable, but then its recommended to retest about a week later. at what point will a woman have enough hcg hormone to where the test result is almost guaranteed....three weeks? you should be able to tell if you were pregnant two months after the risk right? and do they usually have an expiration date? Thanks!
Early on in pregnancy, the HCG level could be below 25-50 mIU/mL. The home test will be negative because the strips won't detect levels that low. With a retest, it's assumed that the levels will be higher and detectable if one's actually pregnant.
As far as "guaranteed" results... that would depend on the home test that you're using. They're not as accurate as a lab-level urine/blood test.
If you had a pregnancy risk two months ago and your periods are still irregular/absent, you should get to the doctor to get checked out. Their urine and blood tests are more accurate than the home types because of the equipment they use. They can detect levels as low as 5 mIU/mL.
You posted about a risk back in June, right? If you're still on the pill, and you're taking it at roughly the same time every day like clockwork, your risk is very low. Some women's menstrual flow will change from month to month when she's on the pill - you may be experiencing that. Check in with your doctor for a definitive answer.
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