Uterine lining?

How quick does uterine lining grow? I’m set for a fresh transfer this Friday assuming my embryos make it and my uterine lining today was at 6.98. I’m confused because during my stims it got up to 14. I’m worried I won’t have a thick enough lining on top of being worried my 3 embryos won’t make it. I kinda just want to break down and cry. I feel like it’s working against us right now 😕