To me, sounds like totally *normal* first day jitters.
smile

Do hope the jitters are lessened today, and will fade away completely in a few days - the arrangement at school sounds like a good one!

My ds is pretty adept at picking up from DH and I whether we're enthusiastic about something or not, so that's a possibility, too, but in general I think most kids are a bit nervous the first day back at school, just about every single year. (Well, I was.)