Account Migration has not begun. There will be an in game message when it's your turn to move. Do not fall for any third party websites that are telling you to migrate NOW. They're trying to steal your information.

On the Mojang studios website it says that my acc has already been migrated, though I did not initiate it, I have created a mc.net acc with the same email, but I am being asked to buy a new copy, I also have a microsoft acc with same name and email.