postmenopausal bleeding and biopsy

Hi

Iam 3 years into menopause and suddenly started having spotting and mild bleeding for like 5 days and stopped . The bleeding started 10 days ago and stopped after 5 days. Not much though. Mostly very light.A trans vaginal ultrasound was done couple of days ago and the results showed 5 mm thickness My gyn said she was hoping it to be 4 mm or less and wants me to have a biopsy . The biopsy is scheduled for coming Monday . Iam so stressed . In US the cutoff is 4 mm . I don’t know if 5 mm is something that is serious . Have to wait and see . And Iam not on HRT and had an early menopause. Iam 47 now.