I'm 16 and I had unprotected sex 2 nights ago. He pulled out, but he said he wasn't sure if he got a little of it in me. He also came, "wiped it off" and then kept going without me noticing. According to glow I had a 33% chance of being pregnant that day because I was ovulating. Now it's 2 days later, and I just got my period. I know it's not implantation bleeding because it's dark red and heavy like it usually is. I know this isn't normal, can anyone tell me what might be going on?