Cramps during orgasm

So I was supposed to ovulate the 27th according to my calendar but my periods not regular some times it comes at 31 days sometimes 36 sometimes 33 and I noticed I been cramping since lastnight, lightly and it was more one sided and wasn’t bad at all and comes in waves but don’t last too i was wondering if anyone experienced cramps after an orgasm due to implantation or am I losing my mind? I think I ovulated a few days before the 27th but I am not sure.