Mother of an autistic child here
From what you describe this a sounds like age appropriate behaviour for a NT child.
But is there any other reason you have concerns such as family history? It runs in our family and I noticed signs in my son very early. I was told not to worry for a long time… lo and behold we finally have a diagnosis age 4 1/2.
I learned 2 things from this that feel relevant here:
(1) If you have concerns, it doesn’t hurt to take yourself seriously and get a second opinion from people who actually know and can see your child in the flesh. It is your right to do this. Put your mind at rest.
Write down concerns (maybe video things that give you concern re behaviours), go and speak with a specialist- not just generic GP. You can find free to access specialist by searching online for e.g. SEND stay and play in your area. You can also press the issue with the HVs at her 2 year check and effectively demand an appointment with SALT (NB waiting lists for SALT can be really long, you may have more success at a stay and play where you can receive informal observations from early years ASD specialists)
(2) good parenting for autistic children isn’t likely to be damaging for NT kids - indeed it’s likely to be helpful (it’s also likely to be more work for you as a parent but maybe not massively more if you do indeed have a NT child)
Many of the strategies and techniques we are being taught now and that are being used by DS school are being used with NT kids because they work very well.
If you educate yourself on what might work for an autistic child and begin using strategies you’re not going to be doing anything wrong, you may indeed be doing a lot right - regardless of whether or not your hunch turns out to be validated.
I always joke that the great thing about autistic kids is that they literally come with a manual (after diagnosis and usually at considerable cost). You can read the manual without a diagnosis 😜 try the AET website and the Beyond Autism websites.
it can be hard to know which manual to read of course - there’s a lot out there.
Many autism charities use a jigsaw piece as their symbol - and for me that’s appropriate- finding the “right match” of strategies from parents and teachers is essential to my autistic son’s success, and the wrong fit is actively detrimental, but this wrong fit tends to
be more the “he will catch on” approach that might be used with an NT child rather than any autism specific strategies. When we have the exact right match of strategies he soars!