DS1's (HFA/lang disorder) eye contact went from very patchy to very good once we removed aspartame from his diet. He does point on request, to request things and occasionally for interest, but compared with DS2, who now points constantly (and I mean sometimes several times a minute!) to share interest at 12 months old, I can see a huge difference between them in the way they communicate and interact with me. Both are very smiley, affectionate boys and love chasing and peekaboo games.
Their language development has been very different so far, I only need say a word a couple of times for DS2 to absorb it, and often repeat it, DS1 didn't say basic words such as cat and dog until past 2.
I do think your gut feel is very important. I just knew DS1 was slightly different very early on, even though the symptoms were and still are fairly subtle and even now he doesn't really do anything which is typically "autistic" and is a very laid back and flexible child.
It's only from reading of HFA children on here that I can really recognise some similarities in DS1. These include lack of understanding in abstract areas, unusual language development - use of learnt phrases rather than spontaneous sentences (although this is improving), recently occasional ear holding, limited interest in playing properly with other children, happy to be around them and chase etc, but a lack of proper co-operative play.
My advice to the OP is to keep observing but try not to worry, the spectrum is massive, and once you're aware of the vast array of symptoms, it's easy to see things in any child if you look hard enough - if there does turn out to be a problem and my instincts are that there won't be, you're on to it at such a young age that your ds will get every available help.