History of uterine cancer- after initial treatment, during check up, doctors said there are "cells" and need further check up. is it recurrent cancer?

Unsure: It would be worrisome to have abnormal cells in a patient with a history of uterine cancer, so the appropriate thing to do is follow your doctor's recommendations for further evaluation. However, just because there are cells that require further evaluation does not mean that the cancer has returned.

May be: It depends on how you were treated, At your age it is usually the Cervical cancer and not the Uterine cancer . So please follow your Gyn recommendation and advise closely. This may be recurrence and can be treated consevatively.