yeah n dont ever!! top right after the first set of sun leaves(round ones),i dont think anything would grow then (would it?) ,when you top you dont get 2 branches that come out of the stem you piched it lets the secondary growth shoots from the next 2 nodes below it become the top of the plant ,somtimes you end up with 4 tops or more depending how the growth shoots are growing.

hope that helps i know at first i thought the branch you clipped grew 2 from it