Confusing pregnancy test - BFP with darker left line

Emily • Momma to a sweet little boy!
I got my first BFP last Wednesday, about 9dpo (top). Took another on Friday and got two lines again (bottom). So the lines are there, but both times the left line, closest to the strip, is super dark compared to what I thought was the control line. Anyone know what this could mean? Two different tests showed the same thing... 
I'm extremely happy to finally have my positive results! But just unsure about what those dark lines could mean.