Congratulations on your impending birth! How exciting
Look, you will probably get a few differing opinions to this. I had to give my DD3 a few bottles of expressed milk within the first week due to cracked nipples but she won't take a bottle now. However, I wouldn't recommend (unless you have to)giving her a bottle for a while...maybe until the 8 week mark? Your milk supply is still settling within that time and expressing can interfere with what your baby demands. I suppose it depends on how much you plan to express. Not saying that it is the wrong thing to do or anything, just my opinion.
But yes, it has taken me a while to wean my first 2 DDs because they weren't interested in a bottle to begin with. Some babies can switch and don't mind going from one to another
Hope I've helped some. Other ladies may have had no problem with it at all so maybe they have some more experience with it. Best of Luck and enjoy your new baby.