False positive?

Ashley • Wed, Aug 07 • 👼 👼🌈

So a friend of mine took a test that came out clearly positive but when she went to the doctor today they said her uterine lining was thick and that the test she took while there was negative. She had started spotting and was worried about miscarriage but they say that they can't tell if she was ever pregnant. Has anyone ever had that happen? This is a picture of the test she sent me.