Cramping after ovulation?

Rachel • Therapist, wife, child of God!
I have heard that cramping after ovulation can be a sign of early pregnancy?
I had unprotected sex a week ago today, and since then have been having mild to moderate cramping. It's mostly felt like menstrual cramps but last night they were worse and felt like it was mostly on one side. 
I ovulated last week and shouldn't start my period until next week.
Just trying to figure out if this could be early signs of pregnancy or what is going on? Usually I just cramp the day before and first day of my period.
Thanks!