Vvvfl? need advice! Help! BFN?

Lara
Glow tells me I'm due on on the 9th, whereas Clue (my other app) says the 6th. 
We BD all through fertile window, and usually I feel very symptomatic for 5-7 days before my period (it's awful) and I'm feeling nothing ! - I do have slight cystitis that's been happening since Xmas day.
I took this this morning, I don't know if I pee'd on it too much as it was showing results as soon as I took it out of my urine stream - I think it may have gotten wet in the window as I can see a blue discolouration.
I know blue tests aren't the best and il be heading out to get a pink for tomorrow. Can anyone tweak ? 

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