Unprotected sex while on birth control

hey, could i be pregnant....i havent gotten my period yet im not due for it so i havent missed it but ive been peeing a bit more than usual, having trouble waking up in the really early monring which usually never happens, i have had a few pretty heafty headaches in the past week and very very light cramps a few times about 2 weeks from when my period is due. I took my first pill of this package about 12 hours or so late which is one of the worst things you can do says the booklet and i had sex that nite and the night before my period was due and i know its not the best time to get pregnant but with all these symptoms what do you guys think, ve also been EXTREMELY tired, i need naps all the time and im only 17 and I used to be okay..i also crave sweets..a lot and feel slight nausea after I eat dinner for about an hour or so which has hapened the past few nites in a row....im going to wait to see if i get my period, if i do..what does all this mean then