It is possible

Could it be a chance that I'm pregnant again, I'm super confused so please help. So I had my last period the last week of March or at least a few days before the last week then one day the first week of April I had a small bleeding but it was only for an hour or two and not much blood. I do take birth control pills and have been kind of late with them in between those weeks so now I'm confused because I only have 3 pills left in my pack and no period. Should I wait ? Sorry to confuse you but I'm not even sure on what to do.