help!!!!

My boyfriend and I had sex August 24th (literally only a week ago) I’m on birth control and I take it perfectly. He finished inside me which we do only occasionally. Two days later my nipples were extremely sore, we do quite a bit of nipple play but I can’t recall them ever feeling sore. Fast forward one week and my nipples are still sore!!! I’m one week away from my period, could I be pregnant or is it just too early to tell?