I'm on my first pack of yaz and i haven't gotten my period even though i've finished the pack(including white tabs) . i had intercourse once and that was in the last week of active pills. i have taken all the pills correctly. should i be worried?

Not yet... but...: 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 urine pregnancy test gives a reliable result if done correctly. One can test about 3 weeks after sex (3 weeks after when conception might have occurred) or 1 week after missing withdrawal period. An Ob-Gyn doctor can evaluate if persistent, worrisome symptoms.