@cheriels FIGO is an abbreviation for The International Federation of Gynecology and Obstetrics. The pathologist looks at your cells that were from your initial biopsy under a microscope and then describes what the cancer cells according to what they look like. Your pathology report assigned Grade 3. You can read about it here.
https://cancer.ca/en/cancer-information/cancer-types/uterine/grading
Here is another Mayo Clinic Connect discussion that mentions FIGO stage and surgery.
https://connect.mayoclinic.org/discussion/how-fast-should-you-have-surgery/
Does this help? What other questions do you have?