Okay so first off I am only sixteen so I

Patient

Q: Okay so first off I am only sixteen so I am absolutely freaking out.
I am on birth control (alysena 21 I believe) and it is a pill I take for three weeks then stop for seven days and then go back on. I have been on this same birth control for about a year now. well on Monday (two days ago) my boyfriend and I had unprotected sex. but to be completely honest im not too sure he was even in me for very long at all. but anyways, at the time I was supposed to be expecting my period. with my pill I go, Sunday moday Tuesday Wednesday Thursday Friday Saturday, repeat. well the Saturday before we had sex, was my last pill before my period. and after I have taken my last pill, my period doesn't usually come until roughly Tuesday night, Wednesday morning. it is now wednesday morning and I haven't gotten my period yet. I am so scared. I want to know if it is possible I could be pregnant? or I have read online that even when on birth control, having sex can change your cycle? so maybe my period will come later today or tomorrow? I am such a bad person with guilt and I need to know what is goin on without me asking my mother. although she would support me 100% I know she would be very disappointed in me. please help me and tell me I'm not pregnant!!

Doctor

A:   This question is currently in queue and will be answered shortly by one of our doctors. In the meantime you may browse our library of answered questions by clicking here.

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