It is a commonly held that your belly will 'drop' before you go into labour. As your body prepares for birth it loses some of it's water weight, the babies growth slows and you physically can't eat as much because baby is pressing onto every single internal organ you have. So quite often you either stop gaining or lose a little bit of weight in the last three to four weeks of pregnancy - probably didn't know that right? I am not sure why it isn't widely acknowledged but it does happen an awful lot.
During this period a baby following a physiologically normal birth will burrow it's head right down deep into your pelvis. This is pretty uncomfortable but it does have a purpose. It pops that bubba in the perfect position for birth. It puts pressure onto your cervix which is turn will help start of dilation in preparation for labour. You may also see a significant drop in your belly in the days or weeks leading up to birth.
In my online Mother's group we were all comparing side by side belly shots to prove we had dropped and therefore would go into spontaneous labour at any moment.
It NEVER happened to me. Statistically speaking I have a shorter than average body length - it makes buying dresses a bitch. I can only assume that meant that my son had nowhere to 'drop' to. Consequently the morning of my labour my belly was out there - as loud and proud as it had ever been!
So just in case you are in your last days of pregnancy. And you are looking at your belly and you don't see 'The Lightening' don't worry. It might just not be something that is going to happen to you.
P.S This was the last time in the last four years my life that my nails were this on point.