30 weeks with a full term uterus

FTM, I am 30 weeks this week and have just been told that my uterus is already measuring full term. I was also told that my amniotic fluid is already measuring 21cm (normal is 5-25cm) and anything over 25cm is a great concern. I am being put on bedrest due to concern of the pressure of the fluid causing my water to break early. Has anyone else been through this? What was the outcome?