When I lie down, I have pain that goes from my lower back down my leg to my knee. It happens when I lie either on my back or on either side. Sometimes it is helped when I put a pillow between my legs but not always. It started when I was pregnant and has continued for 4 years. I'm really wondering what this could be. When I was pregnant, the doctor said it was round ligament pain, but can that continue after pregnancy? Could this be something different?