Those tests--even the store brand ones--are pretty accurate. Granted, there can be false positives (I've had one before), but those are usually caused by conditions completely unrelated to pregnancy. Whether or not she's simply late or she missed it entirely is based on how regular she is, but if she's been taking the Pill properly she should be beyond regular. If she's had a stomach virus, food poisoning, or even a particularly nasty hangover this month, however, the Pill could be rendered moot--which is why most doctors recommend using a barrier method as a back-up.
Good luck. Pregnancy scares suck hard.
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