ftm....my daughter was born Wednesday and till today she has stuck to the three hour feedings and if…

ftm....my daughter was born Wednesday and till today she has stuck to the three hour feedings and if not I wake her up to feed but today all she has done is slept...she ate at 9 and a little at 1 but won't even wake up now to feed at 330 pm...is this normal for newborns?this is how she's been all day...should I be worried?