Vomiting and bad headache

been having Braxton hicks thoughout the day. Came home and started feeling yucky, got a quick headache and very nauseated out of no where. Also began having harder contractions but there is no rhythm to them or anything. Then I finally threw up, wasn't induced, it just finally came up. Headache is still light and still having some light cramping/contractions. I'm 36 weeks and a day. Anyone have this, could it be a sign baby is coming or should I be concerned?