What do you do when you finally got your LO to sleep and he/she makes a big pooping sound? Do you risk waking LO up to check? I always do at home, but sometimes involves un-swaddling and probably waking up. What about when you're in the car?

This question might be coming from the fact that we just spent 10 minutes at a rest stop in the rain... Soothing a inconsolable baby on a road trip. Finally got her to sleep and strapped back in the car seat and BOOM! We hear a BiG poopy!
* fwiw: we're going to try to make it to the next town for an indoor changing area.