I had really bad sharp stabbing pain along my scar and rang my MW. She sent me to the hospital for monitoring, turns out my BP had gone through the roof (they all freaked out at that) I was having early contractions,(a month early) and I had to stay overnight for observation. All was fine and everything calmed down by 9pm, but I wasn't allowed to go home and DH was told (not that they told me) that there was a 95% chance of having the baby that night. I then had to be monitored every 2nd day until he was born, which was still 10 days early.
Hope everything is ok, oh and the only thing I had done that day was walk slowly around the supermarket.