Define "something happen". Something will happen, you'll have the updates. This usually is a good thing, though problems can occur sometimes. I never update on patch Tuesday, I usually wait till at least the end of the week. Assuming no one complains, then I go ahead and update.
If your worried about your copy of windows being seen as a pirate copy, that isn't likely to happen if you have a real copy. There was one patch awhile ago that made peoples copy think they were pirate copies, but windows fix it. (and if you wait a bit you wouldn't have that problem.) What can happen is if you bought the computer from a less the reputable store and they loaded it with a pirate copy. You can take it back and demand a valid copy, odds are you'll end up buying one instead.
I vote you wait until Friday or Saturday, and then run it. Unless you know or suspect you have a pirated copy.
As long as you are getting the updates from Microsoft, you will be ok. In fact, updates are important to keep your computer running to it's greatest potential. If you'd like to learn more about Windows Updates, this FAQ is a great resource - http://windows.microsoft.com/en-US/windows7/Updates-fre...