Pregnancy scare

So before I got my period I took two plan b’s cause we had two scares and then I got my period and We thought we were fine so we had sex again with protection and all that but I’ve been noticing small bits of blood after we have sex or he fingers me or sometimes just randomly during the day while I’m walking around. I looked it up and it said it could be normal but I also saw it could mean pregnancy but idk. I’m very worried what should I do??