Pregnant?

OK so I took a pregnancy test about a week and a half ago or so and came up negative then I did the bleach test and it fizzed and the dissipated which I think mentioned I'm pregnant. I just got off my period like 4 or so days ago but it was only like a 3 day period which isn't normal for me. I got off the depo in December and missed my shot in March. But my periods have been normal ever since then. Now I'm super nauseous even looking or smelling food makes me wanna throw up and it's a all day thing. I've gotten super blue veins in my breasts and my areolas have darkened but not tender. My feet were swollen today. So could I possibly be pregnant?