birth control
"I'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 "period" lasts up until I start my next pill pack. I suppose I can be thankful that I'm not pregnant but if you're considering taking this pill to help regulate your cycle like I did, definitely do another brand."