Period concern

Jossy

Hello girls. Last year in April I started the Deporte shot but I stopped using it last year in August due to the fact that I gained so much weight and my period started to be irregular. After I stopped using it my period when back to normal until this month my period lasted about two weeks and then I started bleeding again after a week of no period. I would like to know if you girls have gone through this before. Is this something serious?