Opinion please ? Breastfeeding.

Denicza • First baby. What a blessing !
So my plan is to breast feed, and I was watching videos on YouTube of must haves for newborns etcetera, one girl said she was planning to breastfeed but the first few days she wasn't producing much milk (from what I hear is completely normal) she felt as if her newborn was hungry so she bought emergency formula, when she called to talk to the lactation consultants she was told not to worry that baby wouldn't Starve.. (The midwives: lactation consultants I've talked to said the baby doesn't need much the first few days) but she took it upon herself to give the baby formula, I guess the baby would cry a lot, and as a new mother her frustration got the best of her, I know I'll feel horrible if I feel as if I'm not giving my baby enough, what's your opinion on emergency formula ?