Formula fed newborn not pooping

Daschelle • Rainbow princess born 12/27 🥰

My daughter is 5 weeks old (almost 6) & she hasn't pooped in 5 days. She is passing gas normally, having more than enough wet diapers and eating just fine. I went to the drs after 2 days and they told me this was pretty normal i guess and to just wait. My question now is when should I take her back in? Like how much longer should I wait? (They didn't explain that to me & since she got a rectal temp i was expecting that to work so didn't think to ask) Im a ftm & although she seems in good spirits im just pretty nervous.