how much is too much?

Samantha
I just today started the process of weaning my 3 week old off of breastmilk due to my developed anxieties from breastfeeding :/ right now I'm doing half and half formula and breastmilk to help try and ease her into formula and I feel like after every bottle she's spitting up a pretty decent amount, I was just wondering, is this normal? For it to happen after every bottle? And is there such a thing as too much spit up? I feel terrible for switching, but I have to do what I feel is right for both me and her. Thanks in advance!