Question for formula fed babies

Jessica • Having my first baby due on June 18
I tried to breast feed but it didn't work for me. So I am formula feeding my daughter ( please don't bash) she's 3 weeks and doing well but poop every day. I mean she's a happy baby but can get gassy and fussy and looks like she wants to poop but nothing comes 
Should I worry it's Day 3. I did call dr like 2 weeks ago and she did tell me not to worry