Depo Provera shot

I got my first depo shot March 2019 and I never went back and got another in December. How long does it take to conceive after coming off the shot? I bled pretty heavy from dec 19 until Jan 2 and then bled March 4 & 5.

We are wanting to try for another baby. Did you have any complications after the shot? I got shots every 3 months since March of 2019 I only had 3 shots total.