Trilaminar endometrium?

Crystal • 1st IUI: 11/14/15, BFP 11/27/15! Miscarried 12/4/15. 2nd IUI: 12/20/15, BFP #2 1/2/16!!!
Does anybody have any insight about not having a trilaminar endometrium? I apparently don't have it this time. I know "they want it" but the ultrasound is showing in plenty thick enough. Also, she said they may give me something to make it trilaminar next cycle if this doesn't work. Does anyone know what they may give for that?