Transfer cancelled because of lining?

Mallory

I have a FET scheduled for 6/18 but my doctor cautioned me it could be cancelled if my lining doesn’t thicken. I’m currently at 7.3 and they’d like to see this at least at 8. It is a natural cycle so I haven’t been up medication yet. Now that I’m ovulating, I started estrogen patches today. Anyone see big improvements with their lining after starting the patches? Or has anyone had the cycle cancelled due to lining not being thick enough?