Bellabie
Where were you before your birth?
Um...in my mother's womb?
Seriously, though, maybe I was nowhere. In my opinion (and I'm just pulling things out of the air), there are two timelines: the general timeline (time itself) and a personal timeline (individual timelines each organism follows once it comes into existence). When an organism is conceived, its own timeline is set in motion, even if the rest of the universe is still going on its merry way.
So, that said, I think it's impossible to honestly answer your question because it's like asking what happened before the beginning of time, since time, for you, didn't exist until you were conceived.
Great, now I'm confused.
Mobius
You were the egg and the seed before you were born.
I think Bellabie was asking where one was before they actually came into existence. The way I see it, when the sperm and egg collide is when the timeline starts.
EDIT: Considering what I said, time could be a tree; the trunk is the general timeline, forming the base for all the personal timelines (branches) that deviate from it. Then the leaves on those branches could represent an organism's current existence in any given location on that personal timeline branch.
Then, maybe, the branches from those personal timelines could represent individual points in time (days, weeks, months, etc.), and then branches from THOSE timelines could represent smaller increments of time (minutes, hours, seconds, etc.) Of course, if you continue on like that time becomes a fractal. Though fractals really don't have an end, and if time began, time has to end somewhere.