INFO I FOUND ON WOMENSHEALTHCENTRE
Short breaks or continuous use Research has shown that birth control pills are more effective when women do not take a seven day break from hormones to have their periods. For packages with seven reminder pills, you may shorten the break by only taking three of the reminder pills and then starting your next pack of pills. Packages with four reminder pills are fine to take as they are. With a 21-day pack, just start again after a three or four (rather than seven) day break. Even if you still have your period, it is okay to start the next package of pills early. Also, this might mean that your period gets shorter and/or lighter, and that is also okay. Each month, be sure to set your alarm or mark your calendar for your next start date. Some women prefer not to have a period every month, and to take their pills without a break. This is okay, because when you are taking birth control pills the lining in your uterus does not grow as much and does not need to shed every month. If you want to skip a period, you may use your pills continuously by not taking a break or any reminder pills.