See OB/GYN to pinpt
The lower back. Sacral (butt) area, along with pain, and aching in the pelvic area isn't normal, and needs to be examined fully by your ob/gyn, who will know what to do, and what necessary steps to take.
It could be due to a number of things involving the female organs, the GI system, the colon
, and a pelvic exam
will be helpful too, along with ur medical, family, trauma, social, ; sexual history.