"The prodrome is a phase that comes before an episode of nausea and vomiting in cyclic vomiting syndrome. The prodrome phase, marked by abdominal pain, can last from just a few minutes to several hours. Sometimes taking medicine early in the prodrome phase can stop an episode in progress. However, sometimes there is no warning: A person may simply wake up in the morning and begin vomiting."
Also used to describe a woman's presentation immediately before labor starts. Experiencing braxon hicks contractions, dilating, etc.
She is prodroming and should go into labor soon. She is in prodromal labor.