28 weeks is this normal?

Ever since i hit 28 weeks my baby girld movements have been hurting me like crazy. Almost every move she makes hurts like hell. Shes really low down and when she shifts and rolls it feels like shes cracking my pelvic area and tailbone. Her kicks are so uncomfortable but bearable. Im a pretty tiny person so idk if that has to do with it but im getting concerned should i mention this to my doctor or is it normal?