Dark bfp line.. why so dark?

Hi ladies, 
Well, I took this test yesterday on first morning urine. I watched the urine run across the screen and the 1st red line appeared even before the urine had finished running across 😱 I'm guessing the second fainter line is the line to show that the test has actually worked. We have been trying for 14 months with thyroid problems and very long cycles. Usually have 40+ day cycles. Actually 'stopped trying' few months ago. Just went with the flow.. then it happened. Since I have long cycles not 100% sure on the dates but midwife put me down as 7weeks 1day. Due date 29 Nov 17 eeekkk!!!!