What if i had sex after my period ended like 2-3 days after my cycle can i ovulate or no but today i feel lightheaded & tired also my stomach have these strange feelings my boobs have small bumps up there?

Pregnancy worries?: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A home urine pregnancy test gives a reliable result by 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If tested too early, a negative result may be a false negative.