NORMAL??

I had my period last month on the 21st of Sep. ended on the 24th. I had unprotected sex on the 28th. And then later I took Plan B. I was fine until this month (October) I got my period again. On the 5th. I understand Plan B can make you spot or bleed a little. But this is more than that. It's like a normal period I've had before. Would I be getting my period again at the end of the month? Since that's my usual date I get it. Or what does this period that I'm currently on mean? Is it the plan b or what could it be? Help