I'm bf and supplementing but if I stop giving her formula and just pump/nurse is that totally fine?…

I'm bf and supplementing but if I stop giving her formula and just pump/nurse is that totally fine? I mean I know she's getting enough breastmilk from me but not sure if she's getting full lol bc I think her formula (similac advance) is getting her constipated. This morning I tried to give her similac sensitive and after she had it she pooped but hard but that's it. 😔