Is this app pretty accurate in tracking your fertile window?

Should I rely on this app for my fertile window? I am not trying to get pregnant. Does it seem pretty accurate for the most part? I've been using it for about a month and so far seems to be great, but I started spotting just a little bit two days before my fertile window (I've never had that happen before or during ovulation)..so was just kinda wondering if maybe I am ovulating a little earlier than expected or something else. Opinions??

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