Period & Plan B

So I had my “normal” period 10/29 - 11/2

It was how it normally is for me.. I start spotting, than heavy flow then it fades and it’s gone.

I took a plan b on the 4th. after unprotected sex obviously, but yesterday I started bleeding again. And I thought it was random spotting BUT TODAY it’s a full on heavy flow...

My question is: has this happened to anyone before, after taking a plan b?

it doesn’t seem normal to me to be loosing this much blood. I’ve been healthy and not as active as I normally am but nothing else has changed.

Opinions ?