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.
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