Okay so usually I have a heavy flow from either day one or day two of my cycle clear until the 6th or 7th day of my cycle and usually my period lasts 8 days or longer. Well this time my cycle was heavy the second day and lightened up the 3rd and I'm on day 6 and my period is basically gone. Why would it do this? Also my period is never at the same time of the month I've had it start at the beginning of one month and then the next month it's at the end and sometimes I wont have a period that month. I don't understand why and it makes it extremely hard to track it.