really hoping its just my birth control, but I'm still going to take a test today... I've been on…

really hoping its just my birth control, but I'm still going to take a test today... I've been on the depo since Oct/Nov and just recently I'm gaining a little weight, sooo hungry, but also nauseous, and my period still hasn't came like it usually would've. And yes, I know its a huge possibility that its just the birth control but it scares me since I've never dealt with this while on birth control.