1 blue, 1 white in ceiling. Two black on switch. I'm stuck

Ceiling fan has 1 blue and 1 white. 1 blue,1 white and switch itself has 2 black. How do I connect these wires? I'm stuck. I probably should've been smart enough to mark them but I didn't. Any clues or advice?

Blue is usually the light circuit for the fan. Connect all whites and hot black to blue. Try fan before closing up everything.