I'm so frustrated and confused

Carry

My last AF was 1/6/19. Glow predicted ovulation 1/28/19 and next AF not until 2/12/19. I have an Ovulite device that picks up ovulation from saliva. This is the 1st cycle I used it and it showed positive ovulation on 1/30/19... so why today 2/8/19 only 8 dpo does it look like AF has already arrived?! I'm soo annoyed with my body. TTC baby#3 after a chemical pregnancy in October and I'm so frustrated!!