Hi Heather hunny..
This happened to me after I had my 1st son... I was waiting to go on the pill after a proper period and it didnt come.... and i had got pregnant!! (unfortunately we m/c, but looking back my body just wasnt ready)
So it can happen hun, and yes, theres deff pre cum before ejaculation.
It is probably just your body settling back to normal cycles, but maybe buy a cheapy test hun, just to put your mind at rest! Let us know what you decide to do hun.
by the way.. stress and worry will only delay the witch from arriving you know.

.. so try not to worry too much.
here if you wanna chat.. or via facebook hun.
caz xx