I asked this same question just two months ago. I noticed a definite change in my scent about a week before I went into labour. I would describe it as a sickly sweet smell.
Sickly sweet could have been a little leak of amniotic fluid, that has a sweet smell.

I was laughing reading this, thinking someone didn't read that right LOL
Yes I definitely didn't read it properly! LOL But glad I could provide amusement