Annoyed!!

so i have been trying to conceive for a while i have been off the depo shot since last dec. the weird thing is everyone that looks at my belly says they think im prego cuz my belly is round and i feel the cramps sore breasts and the mood swings. i take pg tests and they keep saying a bfn. i have done pg tests for the last 3 months i have a feeling i am pg but every test i take is negitve even the blood test. im confused and i dont know what to do or think or how to feel