????? Help is it normal???

Okay so I started my period on the 28th of December. Around the 4th day I thought it ended and had unprotected sex for the first time. Then it made me start bleeding again because I guess my period didn’t actually end. But me still being paranoid and letting the fact I had unprotected sex get to my head I bought a plan B and took it that night. My period pretty much ends s couple days later but now 5 days after taking the plan B I’m lightly bleeding red again. Is that normal??