First Responce test-

Has anyone ever received a false positive from the first response brand test? I tested today as AF is suppose to come today and I received a BFP!! I'm super excited, but my sister had an experience were she took this type of test and it told her she was pregnant, but then with in a couple of days she got a visit from AF. Has this happened to anyone? She suggested I test again tomorrow morn with a clear blue digital test. Any thoughts? Thanks Ladies!