pregnant or stomach bug?

Brittany
So I just noticed I'm two days late in my period which I just got off the depo-provera shot in January because of personal reasons. I haven't been able to eat the past few days I've made myself eat but not much due to feeling nauseous. I woke up tired today and for some reason I'm still tired I get dizzy and very faint at times throughout the day. And I've been having the sh*ts but not much I feel like I really gotta go and then not much comes out. I got 3 sliders from Arby's ate a few fries and 2 sliders got on my third one it was corn beef and I can eat corn beef but I took one bite and almost threw up. And had to spit it out couldn't even eat after that. Opinions please? Sorry for all the info. Just not quiet sure. Thanks in advance!:)