returning to breastfeeding after supplement.

so my baby boy was 9 lbs 3 oz at birth. so they took his blood sugar several times to make sure he was ok. well he did great for the 3 feedings in a row, but then they do one the next day and his was 43 (not 45) so I've been supplementing with a bottle of breast milk/formula. they said that after my milk came in I'd be fine.

so my milk is here and im terrified it won't be enough. he has plenty of diapers more than he actually should, I know he's not up to his birth weight despite the fact that he went up almost an inch. he's a week old tomorrow all signs say he is fine but im still having to wake him up to feed him every 3 hours. he's just such a sleepy baby. he'll stay awake for all hours at night but during the day i have to keep him up between feedings. is he ok without supplementing. i really want him to be on the breast only?