Alarm clock app for different working schedule

I'm looking for an alarm clock app or some sort of app that will allow me to schedule reminder/alarm at different week. For example, I want to set an alarm on week1 at 3AM on M, T, W, Th and then week2, 3AM on M, W, Th, F, Sa and repeat this pattern. Does anyone know anh app that will allow me to do this?

Many thanks!