Anyone ??

I ovulated on April 28th / 29th me & my SO aren't trying at the moment but he was pulling out & a little bit of sperm got inside of me . Ever since Ive been having on & off mild little cramps that last a few minutes which is odd for me I usually cramp a few days before I come on or once I'm on & im not due for AF until May 22nd . Any insight ?! On what this is or could be ??