Pelvic pain during pregnancy?

I am 8 months pregnant with my 2nd child and in February i went to the emergency room for this issue and was told i had a round ligament. as my pregnancy furthered it got better and the pain wasn't as bad but now my bone Lol is in pain and the pelvis bone to!! when i lay down on my left after a period of time my hip starts to hurt and i turn to my right said my bone starts to hurt or even crack! lol what can i do to ease the pressure?? if i walk around for a while it doesn't hurt to lay down and get up it hurts ! what to do? THX