None of them showed anything? Were they all from the same pack?
I really don't mean to insult your intelligence here or anything, but are you sure you did them correctly? Try peeing in a cup and then just dipping the test into it for about 15 seconds. If you still don't get anything then dip it in again.
If you do get a negative, Wannabemommie, I think you and your partner should make an appointment with your doctor to make sure everything is all right since you've been trying for a year now. I'm not really big on actually trying to get pregnant, but there are plenty of women who would be able to give you tips and help in the other pregnancy forums.