Well I have been having some strange problems with my right knee. I can't kneel on it, or if I even slightly hit or or graze it on anything even lightly it really hurts. The pain is similar to a really bad rug burn. I don't know if it has something to do with pregnancy, I'm 9 months pregnant. I don't recall doing any damage to my knee, and haven't gained a lot of weight during the pregnancy 16lbs.