OPK question

Kaitlyn • Mommy to Declan 2-25-17 & Dashiell 7-30-20

Has anyone, who takes ovulation tests regularly, gotten pregnant, but never got a positive test?

I’m asking because last week my tests continued to get darker over a period of 4 days, but never dark enough for a positive. They’ve been up and down ever since so I’m wondering if I’ve missed my peak even though I’m testing at the same time everyday.