Period and Pregnancy

Just wondering. Today I made love with my husband (sorry can’t stand that other 3 letter word) I’ve been feeling crampy like for days now like I’m gonna start my period and according to these apps, my period is past due 1-3 days. We haven’t had intercourse in a few months. Has anyone ever got pregnant when they’re due to have their period? Is it possible? Ps I probably need to go check if I’m on my period right now lol but thought I’d post this first. Something to keep in mind for the future though.