I got on birth control for the first time, and got the depo provera shot Febuary 25. I had ended my period feb 18th I think, cant remember for sure. knowing my period is late is definitely freaking me out to some extent. I know the shot should eventually stop my period, but my OBGYN didn't make it sound like I should the first month after the first shot. also, I did have unprotected sex a day or two after the shot, and let my boyfriend come inside me. help?