Looking for Advice!

I had unprotected sex(he pulled out) about 6 days after my period ended so I knew I was coming up on ovulation. I took a plan b the next morning.

About 5/6 days later I started bleeding again(this is about 2 weeks before my next period was expected). I thought it would just be light bleeding for a day or two but it was like period amounts of blood for 5 days. it’s been 2 days and the bleeding is not enough to fill a tampon anymore.

I also felt quite dizzy and got a random heat flash when I was on the train.

Is this normal/is this a sign of the plan b working?