Hihi, all the best to you! I personally feel that it's good to take between 1000-2000iu of vit D and 300mg of coq10 you can pm me if you wanna ask more.
Focus on today and worry tomorrow, I know it's easier said than done.
Anything that you like to do? Maybe can try to do? E.g. read a book, mindfulness, watch netflix. Calm mood is important too!
I think depending on the type of FET you are undergoing: Natural or Medicated.
Natural: they would need to track the lining of your uterus every two days until it reaches the optimal which is at least 7mm and above. I'm not sure from which day they will start asking you to go back for...