I think i started following Q before this. Dated Oct 6 2017. Looking at qanon.pub- i really don't think that was Q's first post.

?? What say you anons?

http://www.foxnews.com/politics/2017/10/06/trump-winks-says-ll-find-out-when-asked-to-explain-calm-before-storm-comment.amp.html