My 15 year old started her period last summer (2015). Around October of last year she began to vomit once a month. It was simply one episode of vomiting, not an entire day and not over & over...just once. She feels better afterward and would generally go to bed early feeling extra tired. (she doesn t have an eating disorder & isn t sexually active....I m certain of both. :) By January of this year I was suspicious of this pattern. I started keeping track of her menstrual cycle and sure enough her one stop vomit episodes are happening when she ovulates. She s already very regular w/ a 28 day cycle. She s vomiting anywhere between day 12 & 14 of her cycle. It happened again just last night...day 12. Is this normal? Should she see a gynecologist?