Hey! So my period is inconsistent always and has been since I was 14! I’m 30 and can’t rely on that thing ever. However I’m healthy and feel good !

My husband and I had sex last week on a day where it said my chance of pregnancy was like 30% or something high like that. Today and yesterday I’ve had mild cramping in my mid to upper abdominal. Could this be a sign of pregnancy?

My period is due this week, according to this app but like I said it’s slightly unpredictable. When should I take a test?