It will be absolutely fine.
The worst thing that can happen if you go onto combined earlier is a bit of unpredictable bleeding.
You didn't say your age but you are probably old enough to know your way around a pack of sanitary towels 😉
Regarding your dose, 50mcg estradiol is not very high and if you are taking the progesterone vaginally it delivers a higher concentration to the uterus, so some specialists are happy for the progesterone to be taken every other night vaginally.
If you wanted to take it cyclically, this would equate to none for 2 weeks then 1 every night for 2 weeks.
If you would be taking less than your prescribed dose without medical supervision however it would be sensible to book a private scan at 6 months or so to make sure your lining stays nice and thin.