Ovulation test

Does anyone use the dip ovulation tests?  I took one yesterday am and the line wasn't dark enough. I had a hunch and took another one last night after the gym (6:30pm) and the two lines were the same color. I then took one again this morning (6:30am) and it looked like the 2 lines were still the same color. Did I ovulate last night or do you think it will be today. We BD last night and am wondering if we should again tonight or wait until tomorrow.