I’ve been charting & FF keeps moving my ovulation day later & later to the point where it’s saying I haven’t ovulated at all!!! Then today I got a super dark positive OPK, like the darkest one in my whole life. So I got curious & took an $.88 Walmart pregnancy test. This was taken at 8 minutes... I see the faintest shadow!! These tests have never done me wrong but I’m skeptical...