After 7 days the skin is still traumatized and trying to heal, sometimes there's "waxy" areas of skin that will appear as if the ink has fallen out, and any other number of such issues. I'd say wait a couple more weeks before jumping to conclusions about losing ink. That said, have you had any issues healing in the past? Or this time did you feel like something went wrong? Of course its possible but I wouldn't worry about it just yet.
Here's a thread that we talked about some of our favorite aftercare methods, obviously different for everyone but you can kinda see a common thread throughout.
http://www.lastsparrowtattoo.com/forum/tattoo-after-care/32-best-post-tattoo-care.html
Besides that, Welcome to LST! Enjoy your stay, look around and soak up some information. Your intro post is a perfect place to ask for advice so don't worry about pissing people off.