DEPO HELP!

Stephanie
I was suppose to get my Shot the week of Christmas but so much was going on including me passing out, I totally spaced! Come today January 30th, I still haven't had it and I've had unprotected sex with my SO since then, also I believe on Monday, but my boyfriend says last Friday, that I have been nauseous everyday can't eat much, or when I'm hungry go to eat and feel like I'm going to be sick. Could I be pregnant? I started on the 11th & ended my period the 18th..