breastfeeding/formula

I delivered at 37 weeks, 3 days. as of 3 days ago! I have fed her formula the hospital provided, as I wasn’t wanting to breastfeed.

well tonight my boobs starting leaking thru my shirt, out of curiosity I had my baby latch & I swear she was so in love and fell asleep! only downside is I don’t think I can ONLY breastfeed. can I switch between the two? how do I do that? opinions?