Depo & pregnancy

I’ve been on the depo since June of this year, I didn’t start bleeding until August and I haven’t stopped bleeding since. It’ll either get heavier or lighter. When it’s lighter some times It may stop for a few hours and start right back, on the 10th I had unprotected sex and my cycle has been light every since but I’m starting to have excruciating cramps. I’ve had all my shots in the time frame that I was supposed to get them. Do you think I could get pregnant?