I had unprotected sex with my girlfriend and she got the shot a week and 2 days ago. she got it on monday last week. she got her period and got off her period on tuesday the week after she got the shot and we had sex on that wednesday (the day after her period) i heard it takes a week for the shot to be fully effective but she got the shot the day she was suppost to get her period therfore her period was almost a week late and they gave her a pregnancy test before they gave her the depo shot and she was negative. So i want to know is the shot fully effective now and how high are the chances that she can get pregnant ???