Fading line?

Hi All,

The first photo is from last night around 8:45 pm and the one this morning is at 8:01 am. I’m currently 14 DPO and expecting AF today. If pregnant, I’d be 5 weeks on the dot. Why would the line be fainter today? Does it mean I currently am, or am going to miscarry? Has anyone seen this before and there’s a different explanation?