Need someone’s opinion!

I have the Mirena IUD for 10 months now, my boyfriend and I had unprotected sex and he cam in me 2 days ago, which according to my period app would have been the day I ovulated, but we also had sex prior to those 2 days and he cam in me. Today I had cramping almost as if my period was coming/about to start. Is that normal? Am I just over thinking something that’s not there? You don’t think I could be pregnant?