Depo shot but I want to have a baby

I got the depo shot 3 months ago without researching about it at the time it’s my first time ever on birth control and my first shot, my boyfriend didn’t want kids now the time has come we’re gonna want one in a few months after we get married I’m afraid I can’t get pregnant he’s been doing his part you know putting sperm in me. Hoping I’ll get pregnant since I got the birth control without talking to him about it. Is there anyway to get pregnant right after the shot or should I give up??