Prophylactic malfunction

Condom broke while having sex just a few days before my period was supposed to begin. Glow has me scheduled for my period to begin today (May 1) but it has not. I'm not the most regular person. CM seemed between watery and sticky and generally clear the night in question. I know the best thing is to stay calm over the next few days and see if my period starts. Just wondering thoughts, chances opinions of possibly having gotten pregnant. From what I've researched it seems low.