Thanks Bazz. I think it is for both the UK and the US. Its also the day that your baby is considered a real little person. If you go into labour from today onwards, the hospital has to do all they medically can to help your baby survive whereas before V-day, they can use their discretion as to weather they should give it a chance or not. On a more sombre note, after 24 weeks, you are entitled to your maternity leave and pay if you go into labour and things don't work out so well so its quite a big legal hurdle for many people too.
I'm hoping this little one is planning on staying in its little home for a while longer though!
Hope you are all well.
xx