Depo Shot

Aida

So I just got the depo shot about a month ago and I was told that I wouldn’t be getting my period for 3 months. I’m a little confused because I have now been bleeding for about a week. It started off as spotting and yeah that seemed normal to me because I read that spotting would happen. But now I’m full on bleed like if it was my period. Is this normal? Should I be worried?