I am not a doctor. But I think the first dose tomorrow 9 days ahead of FET would be okay
For the second dose, Pfzier's 3 weeks window place it around 4/10, only 10 days after FET. Moderna's 4 weeks' window place it around 4/17, 17 days after FET. That is a bit close for my comfort.
CDC says second dose of both vaccines could be scheduled up to 6 weeks after the first dose, and that is what I am recommending if you have to get the first dose tomorrow.
see second dose section at
https://www.cdc.gov/vaccines/covid-19/info-by-product/pfizer/index.html
Good luck.