July 20th was the first day of my period July 24th was the last. Had unprotected sex with my husband Friday Saturday and Sunday. Then on Tuesday night I noticed brown discharge when I wiped thought I was getting my period so I wore a tampon but when I changed tampons there was no blood then again next day after I wiped there was bright red blood. It's been going on for about 5 days now. Is this my period or what? I also experienced a horrible migraine day after I noticed brown discharge also I've been incredibly tired and sore breasts? I don't think there's any way I could be pregnant (my ovulation day is today) is this my period? I'm worried its something more dangerous.