breastfeeding and formula HELP

N • NV
Hi moms!
I just had my baby on 3/17
I wasn't producing enough colostrum for my daughter so I been giving her colostrum the filling her up with breast milk at the hospital. My daughter actually got used to the bottle nipple which is fine cause I'm pumping and giving her my breast milk. But the question is I give her some of my breast milk and some formula. Do some of you ladies do that?