well i was always abit 'iffy' about the whole timing theory.
i had 2 of my 4 boys with a 3 day cut off, which is technically in the girl zone.
but my baby girl was a one shot deal 5 days before Ovulation.
and im pretty sure that was the contributing factor in her being a girl, because i had not even started my sway yet, and i had no other sway techniques in practice at the time, other than J&D.
so i use to be a sceptic, but it worked for me...:)