When pregnant what makes cough until you throw up?

Coughing: The expanding uterus can compress the lungs causing coughing and vomiting.

Reflux: Pregnancy can make reflux worse and not everybody had typical heartburn. If the coughing is worse in morning, it would also go along w reflux. Talk to ur gyn doc. Try sleeping with head of bed elevated, not eating or even drinking at least 2 hrs before going to bed.