Irregular period (advice?pls)

Sophie

So for the last couple years I've been having really really irregular periods like only having one once a year (but cramping the whole year) and I spent a lot of time in hospital and at the doctors and they never came to a conclusion as to what is wrong, they suggested I start taking the pill to try regulate my period. I'm just a little over two months on the pill and I've been on my period for a month of it like I've been on my period since December 3rd until now and still going. Is this really wrong? 😅 has anyone else experienced this on the pill? (I take cerazette)