What is going on...

As of now I'm 4 days late.yay! While cleaning I started getting this werid ass purssure in my lower back area, enough to make me stop what I was doing and on the floor, my dog stood over me looking at me lol. Anyways my boobs r killing me on top of it and this morning I threw up some odd looking white foamy stuff and yellow nasty stuff as soon as I woke up and started moving around..has anyone else experience this before?