Sick at 37 weeks

What a way to start off 37 weeks. I am vomitting and having some pretty good cramps. Baby girl isn't moving around too much with all the stretching. I never had this with any of my other two pregnancies so this is all new to me. When is a good time to call the doctor? I've thrown up twice. Once at around 8:30 and once just now (almost noon). As soon as I'm done I immediately lay down because the cramps begin. I can't eat or drink at the moment. I even think about ingesting something and my stomach gets angry with me.