I usually wait about two weeks until I introduce a pacifier by then they usually have mastered nursing
I would try and establish latching first, trying to breastfeed within the first hour after birth, before introducing a pacifier. I have read it can be more difficult to latch if it isn't done first just because a paci is easier to suck on for them. But after she has latched a couple times, I don't see a problem in it.