I worried

Im girting really bad im only 26 weeks and 3 days and every time i call my doctor they want see me and say its probably just a uti to drink cranberry juice and i been drinking it for past two weeks and i had done dilated to 2.5 at 24 weeks and they stopped me at hospital and i went to doctor bout it n she said i have to carry my son to 40 weeks. When i have the pain its come n go pain and i cant even stand up straight and my legs go like jello and i been swilling really bad what do i need to do i am worried