Long period.

So this February was my last depo shot. I did not go in May to get my next shot. I started my period in July after not having it for 5 years now. What I’ve notice was since then is that it will be kinda heavy in the beginning then stop 3-5 days max. However this month I’ve had my period for about 15 days now and counting. It’s not like excessively like all day. Since like day 10 it’s more active in the am once I wake up. Nothing like this has ever happened to me before. Anything like this happen to anyone before?