Not millipede, but insect related: Never had this before. Took a dump. While wiping, saw an insect in the toilet swimming and crawling on the doo doo. Of course now I'm curious if the insect was inside me and came out with the doo doo or if it was already in bathroom and was curious about exploring the doo doo. I don't recall seeing that particular type of insect in bathroom before.
Yesterday I ate banana and some leafy greens. Maybe a bug was in there hidden.