Panicked over possible pregnancy 😨😨

Last weekend I went on a second date with a really amazing guy. We ended up having sex that night. He stayed the night, and we went at it for a lot of the night. He only had one condom, I'm not on the pill, and we were both drinking, so naturally we decided to use the pull out method. I took a plan b the next day, so I wasn't worried about it; well, I ended up booty calling him on Sunday. we had more protection, but the condom broke at the last second. I took another plan b, and didn't worry about it. Last night I started bleeding, and I'm worried it's implantation. I'm not supposed to get my period for at least a week, but would taking 2 doses of plan b mess with my period this much? I've been cramping a little this morning, and the bleeding is a lot heavier