I'm in the same shoe's as you.
Our children are very similiar. My ds walked early, very active little boy. I anticipate his needs so he really doesn't have the need to talk much. He doesn't throw temper tantrums yet. He also says about 3 words, ma, da, and hi sometimes. He understands us, and this week I've noticed a baby jibberish coming from him as if he is trying to say complete sentences. I think that is a good sign.
Our doctor told us the same thing about getting him evaluated, however she didn't bring up autism. She said that alot of early learning problems can be nipped in the butt with proper intervention. She recommend we call also. I have the first visit this Friday. I didn't realize that it won't be the evaluation. I thought it would be. Well, we shall see.
I don't think there is anything to worry about, just a precaution mostly.
Keep us posted!!!!
(hugs)