Hi-
Definitely call the Early Intervention System. You do not need to wait for your doctor to refer you. Parents, grandparents, caregivers, etc. are all eligible to refer a child for evaluation. Both of my children were evaluated by EI; my daughter didn't qualify, but my son did, and has been receiving services since he was about 15 months. I believe you can call 800-585-1953. If this is not the correct phone number, they should be able to give you the correct one for your area. When your son turns 3, the school district should pick up where EI left off; I believe you are in U-46. If your son qualifies for speech services, make sure that you request that your service coordinator forward his file to the school district within a few months of his third birthday because EI covered services end the day before your son turns 3.
Also, if your son qualifies for speech services, give your service coordinator a chance to find someone, but do some looking on your own as well. Some therapists won't do EI because they have to travel, so make sure to ask that when you're calling around. (EI services have to be provided in natural environments-home or daycare, etc.) If you have any other questions, please don't hesitate to contact me. We have learned a lot through this process.....