Could I be pregnant?!?!?

Love

So the first day of my last period was March 27th. I had unprotected sex on April 2nd. He didn’t pull out. My period is irregular but today, april 9th i have been having mild menstrual like cramps and back ache. I never know when I ovulate because my period is irregular but it’s never this close together. Could this be implantation cramps i am feeling?