Home tests are quite accurate, near 95-97%. If you passed one several weeks ago and another one in a few days using the first void of the day, you should be fine. A line is a line and if you can photcopy it or take a picture of it, then that is a line. The azo pills and excessive drinking aren't doing anything for you. In fact if you drink a lot of water, the day before the home test, cut back on the water a little to make sure you aren't dilute when taking your home test.