@phimai: The trick to home pregnancy tests are that you have to have a certain level of the pregnancy hormone in your system before it will give you a positive. So you could be pregnant, and get a negative from the test because your
hormone levels are too low. This is usually because you are testing too early (especially if you aren't regular so you only kinda know when you should start). Each women is different, so her hormones are different, so some women have
enough hormones to get a positive result earlier than others (like a couple days before their period is supposed to start vs. a couple of days after). But unless you are on hormone treatments trying to get pregnant, it's practically impossible to
get a positive test unless you are pregnant. Make sense? So if you get a positive, it's pretty much a guarantee that your preggers. If you think you might be, and get a negative, wait a couple days and retest, it could be too early
because you ovluated late and your period is just supposed to be later or something.