Birth control

I got off the depo shot in December 2017 well my husband and I have been trying to have a kid since then. I have had a regular period since I got off of the shot. Last month I had a period the 5-9th then had another one but short one starting the 25th of the same month. Cramps worse then I’ve ever had and was nauseous the whole time. Now that I’m off of the period I’ve been extremely nauseous, hot, and feel as if I’m going to pass out.. what could this possibly be? Maybe a chance I could be pregnant?