gassy and fussy baby when switching formula?

My DD is 8 weeks old, I'm giving her BM and Formula, I switched from enfamil AR to enfamil gentlease since she didn't have reflux as doctor said and rice cereal was making her gain weight more than expected  .. So I switched to gentlease a week ago and since then she's been passing gas all day and pooping just once a day ... is that normal while she has to get use to the new formula ? I call the pediatrician 3 days ago and they didn't call me back 😒 looking for a new one