Who has gotten pregnant with a thin lining?

My estrogen is 1900 so I can't be given anymore estrogen. I am on patches and del estrogen injection. My lining is a 6.4 and looks great...has a triple layer but it never gets thick. This will be my 6th transfer. My re thinks I just have thinner linings and that's just me. I started progesterone. Any successful pregnancies with a thin lining?