Irregular period

I stopped my depo shot about 2 months ago now and my period has been irregular. My period was normal before I got the depo. Now that it's irregular I've been having crazy cramps and bleeding like every other week. And earlier I was dizzy and very nauseous and vomited. That's the first time ever I was like that on my period. I was think to my self if I can be pregnant but I'm on my period.  I just wanna if any of you ladies experienced that or any suggestions of what you guys think? Thank you :)