Speaking from someone who has had numerous losses and also some success stories, I'd just say : If you're lubed, do it again. Sorry if it sounds coarse, but it's the best course of action. Odds are on your side and at least it's fun, right??? Sends you off to work with a smile! Yes, semen has a particular smell, but how do you tell if it's the night before or not? Just my two cents worth.