Hey dani,
Its awesome your breastfeeding Mika!
I;ve got a great Madela electric breast
pump and Montanah's only had a few bottles
in her life,but she has taken breast and
bottle fine.
It depends on the baby tho.The can have
nipple confusion and not want to suck from
the bottle if mainly breastfed.
Sometimes they wont want to drink from the
breast because it is much easier to drink
form a bottle(less effort for lazy bubs

)
They usually recommend waiting at least 6
weeks for breastfeeding to be established
then try iontroducing a bottle.
I think if Mika is gettin 90% of feeds
from your boobies she would have a greater
chance of rejecting the bottle.
Maybe see if you can hire a pump before
buying one?Over here in Australia you can
hire them from pharmacies and our breast
feeding assosiation.THere should be
something like that over there for you.