Too much friction or pregnant?

Hali
Had sex a week ago and then light spotting the next day but only in the evening and went away before the next morning so for a few hours max. and a little over a week of cramps that get worse after sex (2 times in the past week). Boyfriend says I've been sorta dry when he first puts it in compared to what it used to be like so could that be why or am I more likely to be pregnant? I have no pain during sex only after and I should get my period next week. I've been on birth control for over a year and recently I've been careful to take them at the same time every day and he pulls out with a good amount of time before he finishes since we don't regularly use condoms