Irregular periods

Chelsee
I am 20 years old I have a 2 year old and I'm am now trying to conceive baby number 2. However before my first pregnancy I always had normal periods and after her was born I got on the depo shot birth control and didn't get a period at all for almost 2 and a half years then shortly after that I got off and it too about 7 months to actually get a period back however they were normal.. Now I only get periods maybe every 3 months if not more .... And it's kind of concerning idk what to do and if this is going to affect me having another child .... And advice or help on what I should do? 😢