I was also on the depo and it stops ovulation so it's probably just your body beginning to ovulate again i was on it for 3 years and when i got off it took me 2 years to get pregnant
I took the depo for years and when I got off it I had similar hormonal reactions I think it's just your body trying to get back to regular I'm 32 weeks and just now getting back pain and sore nipples but everyone is different just be patient and get an appointment scheduled to make sure and good luck to you both
Have a blood test done . Only way to tell . Pregnancy and period symptoms are very similar . We honestly can't tell u just by you listing what's going on .