If you missed a week of the patch, put on a new one as soon as you remember. Use a backup method until you've used the patch correctly for seven days. Consider emergency contraception if you've had sex in the last five days.
You can try skipping a period by starting the next three week cycle of patches earlier. The date of your next period may be unpredictable.
you have to wait until the next patch
The current live servers are already patch level 4.0.1. The next patch will be 4.0.3, where preparations are made for the shattering of Azeroth. After that, patch 4.0.3A will be the actual sundering.
The PTR is currently up and running for patch 3.3. I am not sure how long it will take until the next patch testing phase, but the only answer from Blizzard is "soon."
Then take it off and make sure you put on your next patch on the next scheduled day you're supposed to.Not much will happen. Your period may be a day or two late but that shouldn't affect when you put your next patch back on.
If your patch falls off, you need to discard it and put on a new patch. You should not reuse the old one. Your health care provider should provide you with a prescription for a single "emergency patch" that you can have on hand for such a situation.
Cataclysm Patch.
If you miss the patch for five days, put on a new patch when you remember. Use a backup method until you've used the patch correctly for seven days. Consider using emergency contraception if you had sex during that five days.
You probably wont get your period until you take a break from the patch next. Some people will experience breakthrough bleeding around the time you were due to bleed.
You may or may not have bleeding during that week when you should have had your period. Remember to use a backup method until you've work that patch correctly for seven days. Start the next patch after removing that one without a patch-free week.
If you start the next month of the patch two days late, you may be at risk of pregnancy. Use a back up method of birth control like condoms or abstinence from vaginal sex until you've used the patch correctly for seven days. YOur next period may be a little later, but your not likely to notice a big difference.
Patch 5.0.0 should be the next major content patch (right before Mists of Pandaria comes out) for World of Warcraft. There probably will not be a patch 4.4.