[Harmony♥]

Any kind of birth control you may go on is bound to have side effects. What you're experiencing could very well be the side effects of the depo shot. It's bound to make your period go out of whack, cause you to experience some things with your body you aren't normally used too. But, to answer your question, since you did have unprotected sex, you did leave yourself open to the possibility of a pregnancy. The only way to know for sure is to take a pregnancy test. You can acquire one of these, at any age, at any local pharmacy, drug store or department store like Wal-Mart or Target. All you have to do is fine an available associate to assist you in grabbing one since they're mostly kept behind locked glass cases these days. If you can't afford a name brand one, I would look into finding a dollar store near you. These tests are JUST AS ACCURATE as name brand ones. Make sure to read the directions, check expiration dates and take the test first thing in the morning when you first urinate after waking up from sleep.

At this point, I'd say the chances are 50/50, but you also have to accomodate for the fact you recently started a new birth control. I wouldn't put all the blame of pregnancy just yet. Take a test and know for sure.