Hi Nell, i too have my first appointment on Monday, but the community midwives have been out a few times because Ryan lost too much birth weight and had a little bit of jaundice, but he's ok now.
I don't go to a mothers group because most of the ones around here are for teenage mums, i do usually take Nick to playgroup and chat with the mums there though which is great.
It sounds like Matthew is doing very well, going by his weight gain.
Take care