Switched formula

I switched my baby’s formula last week from

Similac pro advance to members mark from Sam’s club (says it’s the same as similac) since it’s a more economic choice. I have noticed that she has been spitting up after each feeding about 30 minutes to 1 hour after even though she’s burped and I reduced her ounces (she feeds frequently so she’s getting enough). I’ve read a couple of things online that it might be her acid reflux developing (4 months on the 22nd). I called her doc and the nurse said I should’ve consulted with the doc first. Any suggestions? Should I switch her back?