What Causes Vomiting After Taking Ovral?

My 16 year old daughter's had bleeding for more than a month after gettting her monthly period after adelay of 1 month, Doctor prescribed Provera then after stoping get her periods and from the 4th day has given her Ovral to be taken for 21 days in the night, After taking this ovral she get vomitting feeling in the morning and for last 2 days vomits in the morning. Should I take her again to the Doctor to check or is it normal