Anyone ever got false negative 4-5 days before missed period?
Yup. I was a week late before I tested positive
Yes I tested negative for 7 weeks before it showed up with my first baby.
Yes…i KNEW I was pregnant but couldn’t get a positive with any other pregnancy test other than first response. And that happened both with my second and third pregnancies. 
Yes. I went to a place that did a pregnancy test they said it was negative. 2 hours later at urgent care, it was positive.