Help!

So I am 37 weeks and I woke up this morning

Feeling fine, all the sudden when I was about to eat I felt extremely nauseous and dizzy. This was about 9 am. I ate a piece of bread and kept it down. I decided to take a nap and see if the nauseous would go away and now I am extremely dizzy , have a headache, nauseous and having period like cramps.. I was constipated but managed to go, so now I’m not sure what’s going on. I am not having any crazy discharge that suggests uti. What could this be? I did have preeclampsia with my first pregnancy so maybe I should go get it checked out??