Really scared and confused

Well I had unprotected sex day of ovulation but he pulled out before he was even close and peed before. Well I didn't have any symptoms till 12 dpo when I got sore boobs (only on the bottom) and then I missed a period. I tested at 11 dpo and 16 dpo and both were negative. Today (17 dpo) I started bleeding, I assumed it was my period because it was bright red and I was cramping really bad. And at first it seemed like a lot of blood came out when I peed so I put a tampon in and barely had any blood on it after 3 hours.. So I'm confused. My boobs also stopped hurting after bleeding happened but now I have stopped bleeding... What's going on?

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