Hello, I just turned twenty years old, and in March of 2012 and in April of 2012 I had two periods in one month and the cycle was about 21 days long. But after that it was normal. Then in August of 2012 and in July of 2012 I had two again and they were only 15 days apart. I could really use some advice on what to do. I don't know what to do or how to handle it, or if it is even good to have two in one month.