3 vvfl but a digital negative help

Amy

Hi, I’ve been getting vv faint lines on 3 different tests since yesterday morning. As of this morning the lines haven’t got darker yet (I’m 13dpo) and I took a clear blue ultra early digital and it came back not pregnant. I’m confused as I thought 2 lines indicated positive no matter how faint.. has anyone else had this and then gone on to get a bfp

A pic below of some of the tests