I currently have the inverse problem and solve it in exactly the same way: I'm pregnant and I always feel like I have to pee, even if I just went five seconds ago. I can't tell the difference between the feeling of a full bladder and the feeling of the baby pushing on my bladder.

I deal with it by peeing every hour, so that if it's only been 20 minutes, I can feel pretty confident that the feeling isn't real and I should try to ignore it. I have a lot of sympathy for the astronauts' pee problems these days.