Is this a sign of labor?

Nayy

I am 39 weeks and 3 days and I have not been experiencing any labor symptoms except minor cramping which is normal. But today I keep throwing up everything I eat, right after I eat it. Throughout my pregnancy I really did not experience much morning sickness at all. This is the first time I am actually throwing up this much. Anyone have an idea on what it is or what I should do?