any ideas?

on june 22nd my bf and i had sex and at first for probably 30 seconds i let him go in without a condom and then i told him to put one on and we continued and he never came (i blew him off at the end and i was sitting and it went on my lap butudj iff any got in my area) and im on birthcontrol and it was on the last day of my period. well ever since then iv been having cramps all month like lower back cramps and idk what it is. this is my third month taking bc and im perfect at taking it im never late or miss it. my period is due in a week and im worried i wont get it even though there is a little chance. these cramps are throwing me off bc i have been having horrible cramps on my period ever since iv been taking bc and now im having it my whole cycle???? also im having white discharge which is usually normal for me.
:))