HELP!!!!

I had unprotected sex with my bf just before and just after my period last month. He didn't finish in me and I've been on the pill for quiet some time, I don't even remember the last time I forgot a day. I'm pretty sure I bruised my cervix abt a week after that bc I felt a sharp pain and hard light bleeding for abt 3 to 4 days after. My period is this week and so far I've only had light bleeding. I've taken two early pregnancy tests and they both came back negative. I would also like to mention that I've had more stress in one week than I did the entirety of last year. Could I be pregnant or am I just freaking myself out for no reason?