Gaining weight on depo shot?

I've never been on birth control before because of the fear of gaining weight from it. I finally caved in last week and took my first depo shot. I know it's probably just in my head but I've been scared to eat on a regular schedule or even really eat at all, I'm already uncomfortable with my body but I want to stay protected from pregnancy.. Have any of you ladies gained a lot of weight from the depo shot? Or not gained any at all? What type of exercise do I need to do? This is driving me nuts oh and how soon will I start to lose my period? Sorry I'm clueless 😂 I'm 5'4 and about 152lbs help ease my mind 😔😔