Yeah, it was like that for me too (the quick labour/birth). Scared the shit outta me though -- I thought labour was just starting and needed to first progress. Turns out I started feeling the contractions during transition, and whammo, there was baby. Took my mind a few days to catch up with it all -- every time I had a cramp while nursing my baby, my mind told me it was time to have the baby! Ummm -- no, baby was already born. The aftercramps were worse than the labour and birth contractions!