My original due date was based on LMP. But I knew that wasn't right - I had longer than average cycles so had used ovulation tests. At my scan the due date got pushed back - it's a boy!
Another theory for you... My nan says if you have sex just after you ovulate then it'll be a boy because boy sperm are fast but if you do it just before then it'll be a girl because just the girl sperm are left which are slower gotta love old wives tales
SaltedCaramel, your nan's theory is probably the most famous sex selection theory in history i.e. Shettles!
Before there were other theories, his books sold millions of copies the world over.
There is some science to the theory in that female sperm is slower but live longer. So he suggested sex 2-3days before ov to get a girl on the basis that the boy sperm would be dead and sex at or just after ov for a boy as the boy sperm would win the race to the egg.
@splinters6 well I've learnt something new! I would say I'll pay more attention to what she says in future... but she also thinks smoking and drinking during pregnancy are completely fine (each to their own) so that's why I'm a bit sceptical most of the time!!