"i&#039;ve been on this pill for about 6 months and the first 3 or 4 months i was using the 28 day pack. a couple months ago my pharmacy switched me to the 21 day pack and ever since i have been getting my period on the second week of pills. this &quot;period&quot; lasts up until i start my next pill pack. i suppose i can be thankful that i&#039;m not pregnant but if you&#039;re considering taking this pill to help regulate your cycle like i did, definitely do another brand."