anyone pls help

so I had sex the weekend of June 2 and at first I was bleeding really light then it went to heavy so I'm thinking it's my period and it was 2 days late (it came June 19) we used condoms. I started bleeding and it was like period bleeding so I knew it wasn't implantation blood... but now that my period is gone I feel a little cramping around my uterus area . What does this mean ?