This is probably a stupid question but...

Laura
I was just reading the instructions on my pregnancy tests. I have a first response (pink dye) one and a clear blue digital one. I took one of the FR ones a few days ago and got a faint BFP so I want to verify with the two tomorrow morning. 
Anyway, how come the FR one you only dip in the cup for 5 seconds but the CB one, you dip for 20 seconds? They both only require 5 seconds in the stream. And to use both, should I dip one and then dip the other? I feel like a total idiot here...
Thanks in advance, ladies.