Month long period after birth control😩 HELP!!!

Destiny
I have the same problem! I was on depo for 3 years I received my last shot in October the day after Christmas I received my period. My problem is that it was a month long 😩😩 now I'm trying to figure out when will my next period be! I never have month long periods it's crazy I mean seriously why. If you can give any information I'm open for any suggestions.Â