A boy with Atypical behaviors

Earlier this year while talking with my sons preschool teacher asking her how he was doing she said "he seems to not hear us have you had that problem she asked"? I told her I have had his hearing checked multiple times and he always came back normal. She then asked if I had noticed he was obsessed with red I said sure he has liked it for at least 3 years since he discovered Cars. She then asked if I had any other concerns so I told her about his lack of interest in potty training (he is almost 5) and that he did not seem to really interact with others just played by them. She then asked if he had been tested for any learning disabilities I told her he had been in an early intervention program but had tested out of it fine almost 2 years earlier at age 3 he had been tested at the school district. I asked her if I should worry she said if she was me she would seriously consider having him tested again at the school district. I said ok I will set the appointment and I did. He was tested at the school district and as we are sitting there he did his typical behaviors ie talking loudly, hanging all over the tester getting in her space, struggling to say his letters and numbers in order and generally being hyper.
The psychologist was observing all this interaction toward the end he brought in the results. There was some question as his atypical behaviors were just borderline according to the tests done so far plus he had regressed in his learning things he had passed at age 3 he had lost at almost age 5. The psychologist asked if I had time for some more in depth questioning I said yes.  After this questioning was done he excused himself for a few and came back with those results my son was even higher in the atypical range I had no idea what this meant. They brought me an paper on autism and told me I should look into having him screened further by a pediatrician. I walked out of there in a daze I had wondered about the autism for my son but after his first screening at age 3 I had dismissed it since they told me he was normal functioning. I asked my pediatrician about it he said well if he tested atypical at school district and after looking over the results and watching him he said he is probably autistic. WOW what do you do? Well they admitted him to special ed preschool to work with him and he got an IEP.  He made good progress in the special ed preschool and in his transition meeting it was determined he could just be in regular kindergarten with pull out services. I hope this works out for him and he continues to progress.