Guild Wars 2

I tried to pre-purchase via in-game in the BL trading post.
But nothing happened I did not recieve any title, did not recieve any e-mail and no change occured on my bank account.
However there was no indication that something went wrong.
Should I try again or should I wait for now?

Do you mean you used the link that opens a separate HoT purchase window?

If you continue to have issue, you can try purchasing from buy.guildwars2.com, and if that fails, contact the CS Team via the ‘Support’ link above/below and ‘Submit a Request’ for assistance.

Good luck.