5 week old newborn question

Juliet

Is it bad to mostly pump feed my baby instead of breastfeed. I feel like it puts my mind at ease knowing how much my LO is actually getting. She will normally drink around 3 to 3 1/2 ounces even though i pump around 4 to 5 ozs. I still breastfeed but not as often as i should. Am i a bad mother?