ASD is not specifically disqualifying, and is discussed in a Federal Air Surgeon's Medical Bulletin here. While it isn't specifically disqualifying, you can expect it to take a large amount of time and money to convince the FAA that you are fit to fly.
If you are diagnosed with ASD, you will have to disclose it to your AME. This will very likely cause your case to be deferred to the AMCD, who will consider the totality of your case. This may result in a relatively quick (less than 1 year) approval. It may also result in a long, expensive process that eventually ends in denial. Or anywhere in between.
Note the airman discussed in the medical bulletin was issued a medical, but his symptoms were light and did not require treatment. If you function well and don't see a reason to see a medical professional, I see no reason you would legally be required to disclose a medical condition that, to the best of your knowledge, you do not have and have never been diagnosed with. And I would advise in general that you do not disclose anything to your AME that you are not required to.
If you are diagnosed or if you choose to disclose that you think you have ASD to your AME, definitely find an AME with experience dealing with cases like yours, and have a consultation before going in for your medical. The FAA will want documentation, and if you start the medical prematurely you will not have time to get these documents before your AME has to send your package to the FAA. This will slow down the process considerably.