Hi! I had my period about a week ago, but now I have it again.

I'm on birth control, but I'm only taking it for PCOS, which balances my hormones. But anyway, I started my period last week but I usually start it on the last row of pills and this time I didn't. And yesterday and the day before i started on the pills on the last row and now today I had some bleeding.

I'm really worried because I don't know if this is normal or something my kidneys or anything else. Any information is greatly appreciated!

Thankk you! :]