Faint line 8dpo? Then negatives, FMU from 9-12 dpo

Brianna • 20 years old & have a rainbow son after my first miscarriage 🌈
So I received this faint line at 8dpo & was told it means I'm pregnant even if the line is barely there, it's till there & the test wouldn't pick it up if you weren't . My thing is, is after this test, I've had negatives ever since & just got one again this morning with FMU & 12 dpo... I'm out I guess 💔😞