liningforFET

how important is the trilaminar appearance before FET trigger?
I am on a modified natural cycle and my RE put me on viagra PV to thicken my lining.
at trigger my lining was 12.4mm but homogeneous. The sonographer told me that my uterus appeared more tilted for her so I wonder if it could of still been trilaminar just less apparent?
my clinic still wants to proceed but i worry since it is not trilaminar?