the pill cerelle, confused.

I started the pill yesterday "cerelle" I was told to start it on the 5th day of my period, which was 3 days ago, and I'm still on my period, but now I'm worrying as I've read a lot of people have had periods nonstop since starting the pill, and as I don't want that obviously. I was just wondering if anyone else was on the same pill who had experience with it?