sorry it's been a while for us our youngest is 6 years old.
I can not offer you anything other than
children have a nasty habbit of doing things when they are ready and not before. Some times one child will take longer to develop key things but will be ahead of their peers in others.
While waiting for the appointment try not worry too much. Personally when ever I have had a bad appointment with MCHN maternal child health nurse, I book one with the ped always told me rather crossly that he thought MCHN should not do alot of the testing they do as "some" make parents stress for no good reason. ie child had a bad day.
Good luck with it