I have a 28 day cycle I am on birth control pills I had sex (he pulled out, no condom) on Valentine's Day which is 8 days before my periods supposed to arrive my periods are pretty normal and arrive when the app says it will. Today is the day I was supposed to get my period and I usually get it the night before in my sleep I woke up and didn't have it which sometimes happens it could come later today or in my sleep tonight bc that happens sometimes I'm just scared and worried. I haven't had any symptoms of anything or anything.. I've had a headache today and yesterday not a migraine just a headache and a little earlier I've had a lil cramps feeling like, my boobs don't hurt and my nipples and aerola are the same size as usual. Is it even possible to be pregnant?