Depo

I was put on depo in april, now me and my boyfriend r havin unprotected sex ,an it is almost time 4 me 2 get my next shot in a couple days. But if i dont get on time could i get preganate or could i be now? is it out of my system? i just want 2 know my chances. I REALLY dont know anything bout the depo shot. Thanks
Posted by nikki; updated 06/02/05