3 week old eating too much?

Cm

I upped her formula to 3 ounces about one week ago and now she's acting like she is hungry still after her bottle. I've gave her 4 ounces a few times to see if it helps but I also dont want to feed her too much. And 4 ounces seems like a lot at 3 weeks old. Is anyone else's baby eating that much sometimes? We have an appt with her dr on thursday so I will see what he says then but was curious on how many ounces everyone's baby(babies) were eating at this age