I switched from Depo to Apri 28, no period.?

So i am on the week, that i am supposed to be getting my period, and i have been feeling the exact same syptoms i had when i was pregnant the first time. Tired, aversions, sore boobs, headaches, bloating. I understand these can be PMS but for me, that was never the case. Anyways there is a small chance I can be pregnant. I have taken 3 tests all BFN. i just switched off Depo to the pill abnd yes had unprotected sex in between. Do you think I am pregnant and just tested too early, or is it the shot? The shot gave me my period for 6 weeks. So i just assumed that it would hit normal.