What Causes Severe Abdominal Pain And Vomiting After Taking Meprate?

JHi, I Am 24 yrs..tryin to conceive from last 8 months...I have irregular cycles accompanied with nausea vomiting...on consulting a doctor I was told that I have pcos ..was prescribed meprate for 5 days my current menstrual cycle to start..today is my 2nd day on meprate and I have severe abdominal pain n vomitings..is this a side effect of meprate tablet or I might just be suffering from indigestion?..