What Does Endometrial Lining Of .96cm Indicate?

I AM 51 AND HAD POSTMENOPAUSAL SPOTTING LAST WEEK. I HAD A PAP, ULTRASOUND AND PELVIC ULTRASOUND AND WAS TOLD MY ENDOMETRIAL LINING IS .96CM AND I'M SCHEDULED FOR A ENDOMETRIAL SAMPLING IN A FEW DAYS. I'VE NOT HAD A PERIOD IN 3 YRS. AND DO NOT TAKE HRT . IS THIS NORMAL FOR THIS PROBLEM? I NEVER HAD CHILDREN AND HAVE A NARROW CERVICAL CANAL AND ALSO THE DR. TALKED ABOUT A PARTIAL D.&C. PLEASE HELP ME TO UNDERSTAND THIS CONDITION.