I got pregnant on the depo and didn't find out til 2 weeks before my second trimester. So I know it's very possible. We are currently waiting on a little girl to arrive :)
Eating a lot of sweets and getting out of breath aren't symptoms of early pregnancy, and drunk people do smell nauseating. You may still be pregnant, but morning nausea with no real triggers and breast tenderness are more reliable symptoms.
I got pregnant with my first child while on the depo shot & I made sure I got the shot on time but it happened I didn't know for sure I was pregnant till I was 2 months I found out cause out no where I started getting sick every morning took a test and got a + went to a doctor and found out for sure.