I have always been a 28 day girl!! my af funny enough use to come everysingle 4 weeks dead on the day i get child benefit for my son its how i always knew well 4 months ago it all changed and then it started to ne 26-28 days long!! then last month it was 37 days long this month i am on day 30 tommorow ? its frustrating as it never messed up till i started trying!! We not been charting or anythin as i didnt want to go down that route! but may do soon grrr!! why is this happening!! xxxx