Extreme cramping and nausea 21 weeks

Alissa

Hi guys so for the last week i have been having extreme cramping in my uterus that shoots pain down my legs and makes me want to vomit. I keep calling maternal fetal and they keep telling me its just my abdominal muscles. THIS IS NOT MUSCLE PAIN. This feels like ive had cysts on both sides that ruptured and wont go away. Does anyone know what this could be since my doctors wont take me seriously.