Ok I went to the doctor on a Tuesday and I got the depo shot for the first time, the doctor said because I was about to start my period (the pee in the cup showed there was some blood) she went ahead and gave me the shot. So that Friday (still hadn't got my period) I had unprotected sex and he came in me, it had only been 4 days and I'm just curious if I could be pregnant? Its Wednesday and still no period?