["I wasn't feeling well but didn't get enough warning so I didn't make it to the bathroom in time.", 'Oh no!  Happens to the best of us.  Are you feeling better now?', "I am but I can't believe it happened in front of a room full of people, yikes!"]
Oh no!  I would hope that people had compassion for your situation and if they didn't, well shame on them.  I once peed my pants at a wedding I was laughing so hard.
I wasn't feeling well but didn't get enough warning and I didn't make it to the bathroom in time.