Lining thickness

I have a question re: thicker uterine linings.

Im scheduled for my FET 6/16, and had an US/blood work yesterday. They said my lining was 15mm and trilaminar and my estrogen was where it should be (can’t remember the value). I asked if that was getting too thick and whether my transfer could possibly get moved up, but the nurse said no that it was looking good & to continue according to my protocol. I just worry about being on 3-4 estrogen patches now vs the 1-2 I’ve had the past week.

Has anyone ever had a problem with too thick of a lining or had success with 15+? I thought I had read that 12-13 was ideal. Next US is 6/10.