I been on depo for 3 months. I was supposed to go back on the 29th of September but didn t go. My boyfriend & I had unprotected sex on my misses shot until now. I didn t have a period in October & still didn t come on my period. I ve been really sleepy, headaches, nausea, food cravings, dizziness, stomach & back pains, etc. could I be pregnant?