Sounds like sciatic pain. Try sleeping on your other side or with a pillow between your knees.
Most likely your sciatica, I have the exact same thing going on and have been for months now! Its no fun and not a whole lot you can do to get rid of it. Try a maternity belt, thats the only thing thats helped me
Oh sister! With pregnancy anything is possible lol sorry about the pain but your baby could be very big maybe IDk I didn't get that type of pain but I sure did get all sort of weird pain and it's just pregnancy. Your baby is fine...just call your doctor and tell her what you experiencing...she will guide you from there.