right butt 22 weeks pregnant

Hi momsh, ask ko lang po sinu dito naka experience na sumasakit yung right butt pababa ng legs, hirap magwalk, mag sit, mag stand up.. yung pain na parang naipitan ng ugat. Nagpa check up nako and my ob gave me pronerve, pero kasi im still in pain, and hindi masyado na explain ni ob what causes that pain.