To everyone who read the books and then watched the series, do you guys had theories when hocrux was introduced in half blood prince that harry would be a hocrux?

Also, is there any sites where I can read theories on harry potter before the final book came. I watched the movies and then came to the books. So I know pretty much what is going on but I still feel what an experience would it have been to theorise and be shocked after each passing release.