Could My Endometrial Thickening Be Due To Stopping Progesterone Early?

My endometrial thickening measures at 37 mm. I am sledding heavily I was put on progesterone for 10 day to stop my bleeding but I only took the progesterone for 4 days and stoped and then got my vaginal ultrasound done. Could that be the reason why my endometriosis thickening is at 37 mm because I didn’t finish my entire medicine? Could it be taken from a polyp?