1. The pregnancy test has two red lines: one at T and the other at C. It's a positive sign, indicating pregnancy.
2. A red line of pregnancy test stick: only C has a purplish red band, and no purplish red band appears in T. It's a negative sign, which means she's not pregnant.
3. There is no red line on the pregnancy test stick: C does not appear purple band, indicating that the incorrect operation process or the reagent strip has been deteriorated and damaged.