Hi, Periods can be late due to stress or other lifestyle changes, so her period could just be late. While home pregnancy tests are a cheap and fast way to find out whether you re pregnant or not, they arent always correct, they are known to be wrong on occasion. So this is what you can do, take another home pregnancy test in around a week or go to a doctor one week from now and ask him to run her blood to check whether she is pregnant or not. You can also get her to take another home pregnancy test right now to confirm whether the first test is right or wrong, but anyhow take a test again in a couple of days. And if you dont want to go to a doctor, just wait a couple of days, if her period starts, she s not pregnant. I hope this answered your question.