faulty tests

Just wondering. is it possible to request a refund from a company for faulty pregnancy tests??? A friend of mine bought one brand and got two lines but on every other test she has done it's negative. so she told me to do one of the same tests. baring in mind I only ovulated 3 days ago and had sex that night only, And haven't had sex in 3+ months before that point. It came up with two lines in 2 mins :/ would she be wrong for wanting her money back?