pregnant??

I'm diabetic. I've been on the depo shot for about a year, and my period has completely stopped coming since about the 2nd time I got it. I don't even get symptoms or anything. my
boyfriend and I had sex w/o a condom a couple times. lately my boobs are feeling itchy and tender, I'm tired all the time and I'm getting cravings. could I be pregnant or am I overrreacting? how long should I wait to take a test?