Endometrial Ultrasound findings and next step suggestions

Ten years post menopause I noticed mild vaginal bleeding and contacted my primary care physician. She ordered a pelvic and transvaginal ultrasound ( I drank 5 cups of water in 1/2 hour, waited 1/2 hour, and then had the ultrasound; no peeing allowed before the ultrasound). The results are listed below:

OVARIES: Right was normal could not see left ovary due to gas? Should I insist the left ovary be checked out with further testing.
ENDOMETRIUM: markedly thickened and measures 2.3 cm. Careful follow-up is recommended.
ENDOMETRIAL STRIPE: markedly thickened. This finding is consistent with endometrial hyperplasia or neoplasia. Careful follow-up is recommended.

What does the pathologist mean by "careful follow-up". Should I expect to be referred for a Hysteroscopic examination after I see the gynecologist in January (yes, that is the soonest I could get in and she is a Nurse Practitioner so may not do the Hysteroscope procedure).

What are the medical procedural steps I should request/expect to get a reliable diagnosis?
I have been using a vaginal estriol cream for atrophy/extreme dryness. Should I discontinue use of it while I wait for a diagnosis? My Doctor thinks it is fine to continue with it. I am thinking of cutting the dose in half just to be cautious or may find a substitute and discontinue it altogether. Research shows it does not contribute to endometrial cancer but I wonder.
Any thoughts on how I should proceed would be greatly appreciated.