No power or lights in bathroom
1 - "nothing was flipped" is not always clear. Sometimes a breaker can trip without being obvious. If you know which breakers power the bathroom circuits, flip those all the way off/on and see if that fixes the problem.

2 - Check the bathroom outlets. If any of them have a GFCI then press the Reset button. The outlets for the bathrooms may be sharing a circuit, all protected by one GFCI, and while lighting generally is on a separate circuit, it may be connected too.