No. You did nothing wrong during pregnancy. Please believe that. These things happen, and they are quite common occurances. All that means is that during that certian time during development that area didnt develop as expected. Not that you did anything to cause it.
My YDD had this issue, her eye does not move so she is missing her upper gaze. It mean sthat she turns her head to keep everything inher line if vision.
This has caused some torticollis, which is common, and should be seen by a PT if your notice his head tilted to one side.
As for the looking different, I know the thought is scary. But your child will adapt and not feel self conscious if you model that for him. Kids have teased my YDD for using a White cane. Yes she gets upset about it. But its short lived. And she knows that she is loved and she is perfect just the way she is.
The surgery I know nothign about, so hopefully someone can help you with that aspect of your concern.
Good luck.
Jenna and Michael, lucky to have Adam, Mady, Aidin and Bryn.