please lord! help me!

I'm 26 weeks 4 days and for the past like 6 or 7 weeks I've been having a lot of hip pain, only in my right hip. There is nothing I have found that relieves the pain. And sometimes it's bad enough if I've been walking a lot that my whole leg will lock up and I won't be able to bend my knee. I still have a ways to go and I don't want to take FMLA at work. I work in a hospital as a PCT on nights. 3 12- hour shifts a week. Has anyone else had this issue and found anything that helps?