Hi I Just Started Getting Depo Shots In January I

Hi I just started getting depo shots in January I was due for another March 20th I was a week late from getting it but I did have unprotected sex March 25. I went and got the shot on the 27th of March. This is now going into the middle of April, and I haven't had period yet. I've been gaining a little weight and eating a little more since the recent shot. So because I'm new to having this is normal or could I be pregnant?