TTC for the longest

Hey everyone ??.
Had sex on my period, 2-3 times trying to get pregnant, they have said it was possible. My period lasted from the 8th to the 12th. After 2-3 days, I only bleed if I put a tampon in, or after sex. Now that my period is over, I have really bad pelvic pains. It's unbearable. I never had this pain before, it's only on my left side, and sometimes it moves into my back. Help?