I'm been on birth control for 2 months now. My boyfriend and i had unprotected sex monday this week. I missed my first pill ever on thursday the same week. I'm wondering if I could be at risk for pregnancy because i missed a pill on thursday. I'm on birth control to regulate my period because I'm very irregular. after i finished my first pack of birth control, i got my period, which was early in july. that was the frist time i had it since, about a year or so. anywyas, ever since then, i've been bleeding, and i'm not sure if this is vaginal bleeding, or left over blood because i haven't had a period in a while. my doctor informed me that i do have very low estrogen levels. but now im worried that this may be vaginal bleeding ( a sign of pregnancy). i'm not sure whats wrong. am i at risk of pregnancy right now? how can i tell?