right, ok! HELP!!

so if you don't chart, temp, or use ovulation sticks, you can't be certain that u ovulated when glow predicted, right? so if you're due AF in a couple of days but still getting negative tests... is there a chance you ovulated late? I really have no idea . I started using ovulation sticks about 3 days after i stopped bleeding with my miscarriage and got this result. so.i gave up.

HELP!