Breastfeeding & pregnancy

Wondering if any mamas who have gotten pregnant while breastfeeding could help me out? Af is due today but so far no sign of anything. We started trying last month. I have been having regular periods for 5 months now. Is it possible that still breastfeeding could stop me from getting my period randomly or could it be that we got pregnant? I’m not getting my hopes up yet. But just wondering if anyone could give me some opinions.