...Another factor to look into: Lunar-ception!!! Some people think it's way out there, but I'm seriously wondering!!! The concept is that as well as being fertile during the obvious times mid-cycle when obvious fertile mucous is present, it is also possible to conceive according to your lunar cycle - that when the moon is at the same phase as when YOU were born, you could have a kind of 'break-through' fertility even if it's at a wierd time of your cycle, and that sex can actually trigger than moon-influenced odd patch of fertility...