Cyst popping or period??

Shania

So yesterday I was in the hospital because I was in so much pain. They did a ultrasound and said I have a cyst that’s to big and need to follow up with my OBGYN. I’m due for my period tomorrow but last night I got sharp pain and started bleeding. Today the bleeding is a lot. I was wondering is it the cyst popping or the start of my period??