I had 2 endometrial biopsy-both came negative do I need another biopsy?

Hello , I had 2 endometrial biopsy-both came negative; last biopsy-one and a half year ago,vaginal ultrasound -one /33mm/fibroid was found.One day ago between my period I found on the paper just lille bit tinny light color blood and it stop.
Do I need another biopsy? I am 51 female, no more symptoms.
Thank you