Possible autism?

I have a 2 almost 3 year old son who I think may have autism. He has been in speech therapy for about 9 months and has progressed immensely and can now form complete sentences although he is hard to understand still. Since he was 9 months old when he gets excited he puts his hands out and shakes his body in excitement. I’ve mentioned this to the pediatrician at every visit and they basically say if he hasn’t grown out of it by 3… My son is incredibly social- he loves people, sometimes too much. He has kissed complete strangers to say goodbye. He’s incredibly smart, he’s known his ABC’s since he was 2 and he can count past 30. He’s starting to read some words including colors and numbers. He knows his planets and dwarf planets and he’s starting to recognize some states as he has been obsessed with them lately. At our local children’s museum they have this large tunnel and you’re supposed to put fluff balls into it and then air will shoot them out, but my son says it’s too cold when he puts his hand into the tunnel. He also is scared of the blender and runs away when it’s time to turn it on. He loves jumping off of the couch or running into people on purpose. He is completely routine oriented. He has to say goodnight in a very specific way or else he will have a really tough time going to sleep, which it already takes an hour for him to fall asleep. He’s aggressive when he doesn’t get his way, he will bite, scratch, hit, kick, or thrash his body whenever I try to out him in timeout. He’s started scratching and biting his sister to the point of leaving marks and I just don’t know what to do to keep her safe. I feel like his behavior has been getting worse lately. If my son is autistic I’m not sure if knowing that would help me to handle his behaviors or if there was support I could receive to be better equipped to handle him. He can be so sweet sometimes and he genuinely seems to care for others and he’s very affectionate. My husband doesn’t want him to miss out on opportunities in life if he is diagnosed wrongly or if he can get by without any sort of diagnosis. Which is why I haven’t been pushing it too much when I go to the doctors. But I feel like the signs point to it more and more.