I also used an ovulation test kit and kept getting negative results. Sorry to give all the specifics, but I was peeing on it and thats when I would get the negatives. I called the manufacturer, and they said to try peeing in a clean dry cup and inserting the stick. I tried it that way, and got my positive at the right time. Also, I had to do the ovulation test 4 days in a row before I got my positive and found out I am more irregular than I thought. Apparantly they are very finicky. I got pregnant that time around. As for the the home pregnancy test, maybe the same thing? I used it with the "pee in a cup" method as well.
I hope this information helps you, and good luck to you.