Suggest Remedy For Mood Swings And Craving For Food

i'v been on the depo inj for about 3 years now but 2 months ago the clinic only had the 2 month one and not the 3 month one i'v been on so i took it......but the last lets say 3 weeks i have been having very bad mood swings and cravings for stuf i never eet is this because of the inj or what is the chance of me being pregnant