Is she just being vindictive?

3 days ago i took an EPT Certainty test (digital) and it came up positive...yesterday and today i took 2 more (only cause there was 3 in the box) all 3 came up positive...my friend who has been trying to concieve (with no luck as of yet) is trying to tell me that HPTs arent accurate and that im not pregnant...is she just being nasty cause she hasnt yet gotten pregnant?