Hello, I had my forst depo shot 3 months ago, I was due to have my second dose last week... I missed it. I had unprotected sex, the day after I came on my period. (well bleeding a little.) Now I have really bad belly ache and cant get off the toilet. Could I be pregenant? I only had the depo shot once. and didnt bleed at all whilst on it but I am bleeing a little now. I had unprotected sex a week ago now, and I am still bleeding a little and have really really bad belly ache. HELP!!!