Sorry if this is long - need to vent as have been stewing over this for almost a week!
DS went to a private nursery from 8mo and has always had friends and has been sociable. He started YrR in September, he only vaguely knew Boy A as i know Boy A's DM quite well (Boy A didnt go to his nursery). He knows Boy B really well as they went to nursery together but werent 'really good' friends although they do get on well.
He didnt know anyone else in the school as the nursery was in a different town so they all dispersed to different schools.
I thought he was settling into school really well despite only knowing two boys, his teacher said that he can be a bit quiet and doesnt really instigate conversations but is happy to join in when in group activities.
Some of the other parents have started having the DC's round for tea, i didnt get involved in this at first as i wanted to see who his friends were and i didnt want to just invite anyone over. He has been invited to about four birthday parties since Sept but no 'playdates' until last week.
On Monday he went round to a friend's house, the first invite we have had but it was a disaster. The mum obvs hadnt told her DS (lets call him Boy C) that my DS was coming. I also hadnt realised that Boy A was also already there. Boy A and Boy C basically took the piss out of my DS. Not bullying as such but they clearly didnt want him there, lots of 'what are you doing here - we didnt ask you to come and play - get off my toys, you cant play with them etc etc. Anyway it calmed down after a while and my DS didnt even seem to notice the pisstaking but the other DM was like this
the whole time.
So i have learned that DS isnt actually best mates with Boy A and Boy C - i can live with that and wont encourage the friendship. I can then leave Boy A and Boy C to it.
This left me thinking about who DS is actually friends with... i thought he had bonded with Boy A but TBH regardless of their age (4) i wont have DS spoken to the way Boy A did. He still classes Boy A and C as his friends as he doesnt have the self awareness to realise what they were doing 
I then thought about Boy B (the nursery friend) - his DM is in a tight knit group of friends and i dont want to just barge in and demand that we 'join' IYSWIM. Although i think with a bit of chat i can arrange to meet up with them sometime out of school and see where that goes.
However, i am now worried about DS. A couple of weeks ago he mentioned that nobody would play with him in breaktime - at the time i didnt let it get to me as (a) i used to say that to my mum so know what DCs can be like and (b) it may or may not have been true or maybe just for 2 mins or something! I said to him that he needs to just join in with the other children as i am sure not all of them didnt want to play...
Now i am left in a dilemma - do i start being pushy mum and micro manage his life by trying to arrange meet ups with DM's or leave him to find his way.
Both DH and I hated school and felt like 'outsiders'. We thought DS had more confidence than that but after this we are not so sure. DH thinks i should steam in and get people round for tea, but as i say i now dont really know who his friends are - i thought Boys A and C were his friends but they were basically vile to him 
So i am really looking for a bit of perspective here. The answer i want is 'dont worry it is too soon and he will find his way'. But DH worries that if we leave it too late then cliques will have formed and we will be too late. DH and I are clearly trying not to project our own crappy schooldays onto DS!
Yep that was an epic - and yep his is our PFB! I fear the minefield is just beginning!
Perspective please oh and hand holding or slapping with wet fish
TIA