I don't think it's ever too early to contact home, if you can find the time to do so.
Parents generally appreciate it, and if their child is normally not too badly behaved but are playing up a bit because you're new and they don't have many lessons with you, it could help to make their parents aware of the situation before it gets out of hand.
I am just about dragging myself into school each day now. An 8 week term is just too long, and I've had a lot on with trying to organise my first residential trip. I've now got nearly enough pupils to run it, but it's taking so much time and effort in terms of redoing budgets based on different numbers, contacting parents, chasing reply slips, etc.
On top of that, I'm trying to buy a house and just haven't had the time to do much about it so I think the estate agents are going to start pestering me soon for mortgage/solicitors details.
Overall I think this is going to be an OK year though, once we're through the long Winter terms.
My mediocre top-set Y11 (top of 2) have really knuckled down this year and they're doing everything I ask of them now so they're much better prepared for their assessment this week. My bottom set are still really challenging as I'm teaching 2 different qualifications in the same room, but after half-term one pupil with complex mental health needs should be taken out and supported by a new member of support staff, and after Christmas the bottom 6 pupils will have finished their qualification and gone to extra English/Maths intervention, so I'll just have my GCSE candidates who are mostly lovely. Things can only get better!
My Y10s, 9s and 7s are great too, it's just Y8 I'm finding difficult. They're much better than the Y8s I had in my NQT year (they stay in their seats, they don't throw things or swear) but they're just really chatty, slow to follow instructions, and don't work hard enough.