Same exact thing happened to me when I did a test join for Jenna Haze.
Started noticing a lot of little charges after that, and it had nothing to do with the fine print.
Destroy the card and get a new one
Sucks I know, but it's the only way you can rest easy.
Hope you figure it out.
P.S.
The domain auction - ThroatFuck.net is ending today on GFY Buy and Sell.