16 days late help!!

Help please ladies. I’m 16 days late and no sign of AF last time I tested was August 7 and it was neg and today I tested with afternoon urine and as the dye was running I definitely saw two lines for a good minute or two as well as my husband. Then it disappeared a few minutes later it went away completely. Then it dried and was no longer valid and the line appeared back in the same place I saw it.

Top photo — was invalid past 10 mm

Second and third photo right after the line disappeared.

I have a normal period and had light and I mean very light spotting on August 7th the last day I tested