I have 2 children on the spectrum, 1 with Asperger and 1 PDD-NOS. The worst part for me in the beginning was accepting that this was going to be a part of our life and that I was hampering my son's development if I tried to deny it. Personally, I don't trust the public ISD. That's just my personal opinion. Take what is offered but don't hesitate to outside of the ISD to try other services. I don't know where you are located, but there is a PT/OT center in Rockwall called Excel Pediatric Therapy that was very helpful for my son and also our church, Lake Pointe Church in Rockwall, has a special class on Saturday evenings and Sunday mornings for kids like ours. It is very important to find your support system in friends, family, and other moms who "know" what it's like to have a child on the spectrum. Educate yourself, know your child, take a deep breath, and be his advocate.
Oh, back to your original question. At 2 years old my son didn't speak, screamed til he was 4, didn't make eye contact, had a obsession with one particular movie. Now he's 11 and if I didn't tell you he was Asperger you wouldn't know it. You might think he was a little "quirky", but you wouldn't know it was Asperger. Be encouraged--it's gonna be okay.