Baby not sleeping through the night.. 14 weeks

I hear so many people mentioning that their baby sleeps through the night.. 8 hours, when they are put down to sleep until morning etc...

Is anyone not having this sort of luck with their baby? And instead having to wake up twice at night / every 3 hour wakings at around 14 weeks?

Please tell me its not just me and that eventually she will sleep longer than 3 hours at a time.