Hi steph, I have had it done. You will slow down by morning. I wouldn't worry. Just for your peace of mind you mind take a towel to set on in the car and bring an extra pair of sweats. What they did with me was they gave me an enema before hand and had me hold it as long as I possibly could. That pretty much cleaned out anything that was left behind. When they do the coloscopy they pt you in what they call a twilight sleep so you are awake but you have no clue what is happening. It will be over before you know it. Hang in there and let us know how it went when you get home.
love
carol