so. i know this might be a stupid question but i'm 16. so i am pretty stupid. ever since i started birth control my periods are 4 days and light. my period was just over with this recent friday, but for the past two days ive woken up at 3am to puke. my boyfriend and i usually have sex about once a week, the last time we did was about a week before i got my period. is there any way i could be pregnant?