Dark enough to be a positive?

[pinklizzy]

I'm on CD17 today, in my first cycle since having my mirena removed and have been using opks since about day 11. Yesterday I got a second line for the first time but it was pretty faint.
This afternoon I actually managed not to pee for 4 hours beforehand (I never usually manage this) and got this result

https://i241.photobucket.com/albums/ff73/pinklizzy_photo/3c3281f4-9f6d-42de-b464-78d740fa9a99_zps6e870e3a.jpg

At the moment I'm just using the opks to try and track my cycles and we'll be TTC from next month but I wasn't sure if this is dark enough and should I carry on using them?

 

[mnicole]

Looks quite positive to me!

 

[RobertRedford]

Looks pretty darn positive to me, too! Now get to BD-ing!

 

[chelsealynnb]

Looks positive to me!