Coincidental that you posted this. The day before yesterday, I felt my dd's first tooth coming in and last night (actually, early this morning), she threw up for the first time and pooped at the same time. She has spit up before, of course, but this was different. She is also not a night pooper. And it was stinky, but normal looking. And today she seems fine except for the fussiness. But she's my first lo, so I don't know if this is normal or not.
Maybe some others will know. Sorry I don't have a real answer.