Knee pain

Jamee • 27. Married to the love of my life. Three amazing beautiful blessed children and one on the way due in June 2015.
I have a doctor appointment tomorrow, but I just wanted to if anybody else is experiencing this. I have severe pain in my left knee. I can't put weight on it, I have to have it elevated, it is from the top of the knee almost to the bottom of my calf. Massage makes it worse, ice makes it throb intensely and warmth relaxes it only temporarily. I've heard it could be the relaxin and I'm sure I'll find out answers tomorrow, but I wanted to know if any other moms have experienced this? I'm 38 weeks with baby number four, no recent or past injury to area, no extra use of joint. Thanks ladies!