Anyone had this happen to them?

2 weeks ago I took a pregnancy test (first response) and 3 minutes in I saw a faint line and confirmed with family members to see if they see the line as well, which they did!! The next day I took a clear blue digital and it said “not pregnant”. Later that day I started bleeding, pretty much bled for days like a normal menstrual cycle. What does that mean? Was I never pregnant?

Side note: I never tested again after it said not pregnant on CB