As long as you've been using the patch regularly, you are safe. It's only the first time that your body needs time to get used to it.
If you used the patch correctly during the previous cycle, you don't need to use a backup method in the first week of the next cycle. If you made an error or started the new cycle late, use a backup method for the first seven days.
You only had unprotected sex if you didn't use a patch. The patch use means you did not have unprotected sex, therefore if you always use the patch as directed the chance of pregnancy is very tiny.
Yes, many woman do not have monthly bleeding while taking birth control pills. When your period is two weeks late you can use a Home Pregnancy Test to insure you are not pregnant, for peace of mind.
If you put on a new patch when it's supposed to be your patch-free week, there are no special dangers. You will not be at increased risk for pregnancy. You may miss your period, and you may have unscheduled spotting during the next cycle.
It is unlikely that such a small delay would affect how well the patch works. If you're concerned, use a back up method, like condoms or abstinence from vaginal sex, for the first seven days of this cycle.
The birth control patch is meant to prevent ovulation completely.
No, you don't want to wear the patch during mestruation. However if this is your first time using this method of birth control and you chose to do a "Sunday start" then you will apply the patch on the first Sunday after you have started menstruating. This is ok if you are still "bleeding" because your body will eventually even its cycle out. Your doctor should be able to help answer any other questions or go to: www.orthoevra.com
The patch and all oral contraceptives are based on the theory that you will ovulate after 8 days without the hormones. If you are removing the patch for the seven days during week four and don't put on a new patch at the beginning of the new week you could ovulate on the 8th day.
Yes, if you start the birth control patch mid-cycle, your period will be a bit later than you expected.
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.
It's fine to start the next cycle of the birth control patch early. It does not increase your risk of pregnancy; in fact, it may decrease the risk.
Maintain your patch change day irrespective of when your period begins and ends during your 'patch free' week. For example, if your patch change day is a Saturday and during the 'patch free' week happen to continue bleeding on the Saturday of that week, still restart the patch on that day.