Hello, I wanted to ask, the baby has been eating well for 10 days, dri…

Hello, I wanted to ask, the baby has been eating well for 10 days, drinking lots of milk but suddenly after feeding, she's been throwing up a lot for two days. Why is this happening? I went to an appointment today with a pediatrician, and she weighed her, and she's gaining weight normally. The doctor didn't say anything, but it started two days ago.