Depo injection

Hi I need advice I missed my depo nay last year and I have been spotting on and off through July August September and then bleed straight in December for 4-5 days now I feel bloated/ sore boobs bad back mainly across the hips could this be me getting ready for my monthly or is it pregnancy just never had any of these feelings and could not say wat or how long my normal period last as it had one for years while been in depo ??