Period day 8?!?!

I have been off my birth control since January because I am getting married in June and I wanted to make sure everything is in order to start a family. This month I have finally gotten af without having to take progesterone. Last month I had a 1 day period but it was extremely light. Today marks day 8 and my flow is still extremely heavy has anyone else had this happen to them? Is it normal? My periods when I was on birth control would only last 3-4 days so I am just wondering if I need to call my obgyn.