Are you temping? You should probably know by Sunday if it is too late. Maybe for good measure, but today is much more important.
A lot of DH's don't like to know it's "time" but just would like to have sex regardless. Sometimes you just have to seduce rather than telling them. But I'm the worst person to give this advice because I'm really unromantic and just tell him. He still asks me to seduce him instead, though, so if telling doesn't work, try something sexier!
ETA: just saw your other post. Even if it is normally his job to initiate sex I think that if you did it he would probably like it. Just start foreplay and he will probably eventually want to finish it out!