I'd trust FRER.
I believe the urine is good for at least 6 hours so don't worry about retesting out of it.
THe reason a line is a line is because the only way for it to show up is if there is the HCG in the urine to create the chemical reaction needed to create a line.
I'd say retest with a digital :)
Well when I tested with my last baby, my DD, I was about 14dpo and got the faitest line that only showed really when you really looked at it.
I want to second trusting FRER. With this pg and the 1st one I tested way early and got the faintest of lines and I was pg. You can't 'imagine' that line (believe me, I've tried! haha) so if you see even a faint one, I say you are pg. I usually test everyday and watch it darken, but I'm just crazy like that. haha!
I have only used FRER so I don't have any experience with the others.
YAY for the second line!!
Good Luck in the morning...I hope you get that BFP nice and dark this time.....