Nearly all pregnancies will test positive around 14 days after potential conception. This is because the body produces only enough of the hormone progesterone to incubate the egg; it normally begins decreasing and leads to a menstrual period 2 weeks after ovulation. HcG, "the pregnancy hormone" picks up production of progesterone, thus keeping the uterine lining intact.
So, if you had a negative at 3 weeks, you can rest assured you did not get pregnant.
awsome! thanks so much lauren... the thing about the '2 week' question was that the lady at the health clinic told me to come back again after a week to be sure becuase sometimes conception happens 3 days after the 'risk' so the HCG might not have shown up just yet....? so do you think i should still go in again.. and take the test again? or was that test 2 weeks after the risk 100% accurate?
The general advice is to take a test 14 days after the risk, then wait for your period for one week. If it doesn't show up, test again.
The test will be accurate as it's going to be around then, because again, after ovulation the body can only maintain the uterine lining for around 2 weeks before you get a menstrual period. What it likely means if you haven't had a period yet is that you were lucky enough to have a risk during a time pregnancy was not possible.
14 days is a generous estimate as is -- HcG begins being secreted as soon as 6-12 days, with tests picking it up as soon as 10. It's true that sperm can hang around for up to 3-5 days waiting to fertilize an ovum, and that's why a re-test is recommended when menstrual bleeding is missed the following week. But you can generally trust the results until you get that confirmation.
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