OK I have a question my daughter is 6 months old an I have been on the depo shit since I had her,…

OK I have a question my daughter is 6 months old an I have been on the depo shit since I had her, but lately I have been waking up feeling hella sick to my stomach, an thru out the day I get really dizzy. an when I was pregnant with my daughter before I found out that's how i was... is there any way I could be pregnant????? an has anyone got pregnant on this birth control?