Whenever I lay in bed my vag hurts SO bad!

Whenever I’m laying in bed ready to sleep my vagina just HURTS! I’m 29w3d and I’m assuming it’s my body getting ready? I just don’t know because it’s only when I lay. I’m also getting up often to use the restroom and my goodness I feel like I have arthritis all over my body from how bad I ache when I get up! This is only at night, and getting out bed. The rest of my day is normal, with regular third trimester fatigue. I’m a first timer, so please share your experiences with me!