Advice please.

I was on the depo shot and was supposed to get it again the beginning of this month but I didn't because they changed it a little bit and I got horribly sick from it. Well my boyfriend and I don't use condoms and now I'm a week late for getting my period. 
​I have been feelings nauseous, dizzy and bloated also with some cramping. 
​The other day I had a horrible mood swing where the littlest thing made me cry and the next day I was fine.