Period again or Hymen breaking?

I need help! My period ended Nov 30 and I had sex Dec 1, 6, and 7. Then I started bleeding Dec 8-11. It was so heavy blood like I’ve never had that before and it lasted a short time. I know I took plan B on Dec 1st bc we didn’t use a condom but he didn’t come inside me and we used a condom on dec 6 and 7