FET-My lining is missing the 3 layers

I tried 2 FET cycles with estrogen pills and my lining for thick but never had the triple layer appearance. So we changed things up and I’m now doing Gonal f to make follicles which in turn will produce estrogen naturally. I had my first scan today (3 days of gonal f). My lining is 7.8mm but doesn’t have the triple layer yet. My nurse said It doesn’t matter right now. It just matters that I have It at ovulation/trigger. I’m really freaking out that it’s never going to become 3 layers 😢 i had a fresh transfer in February 2019 and I had the 3 layers. But that pregnancy ended in a miscarriage. I would love any advice. Im so tired of things going wrong and i wish there was something i could do to get the layers.