Forum Moderators: open
People can click on "Find Web Pages that Contain the Term" while searching for URLs to see if they have been included. The referral would lool like:
[google.com...]
Since when your site's listed at google? If it's not at least a month old, you'll see a lot of changes even after the next big update. If you just mean new pages (not a complete new domain / site) than you're pages will also move a lot within the next couple o weeks. I made 12 new pages at saturday - in at monday - out today, so!? Phhhh, stay cool. Other "dropped" pages (new since last week, "dropped" at the weekend) found their way back today. It's normal. Just build your site and forget google ... just for a while. ;)
If you don't cheat there's no need to stress!