Yeah I have pretty bad knee, hip, and lower back pain. More than likely it's just from the extra weight from the pregnancy. I'm hoping it'll stop once I deliver, for you and me. I know how miserable it can be.
Im 32weeks and gained more weight then i would like to admit, and yesterday i expirienced some knee pain so im sure its due the weight gain..
i hope you are ok, be carefull standing up, slower movements are advised at this point :)
Good luck!