Hey guys , thought I'd share this with you all if you use these opk's - I use clearblue because I don't like the guessing of line darkness.
I've always suspicious of the reliability of these because they're so cheap, the whole 'get what you pay for ' mind set I suppose.
Anyhow, I decided to do a wee test on a couple of them since I know I'm ovulating today. Both these tests were used on the same pot of pee, at the same time and same batch of tests. One of which I would consider a much stronger positive than the other and probably would've dismissed the top test -
hopefully this helps some people that never get a normal 'as dark as the control line positive' not to worry! Just because it's not as dark doesn't mean you've not ovulated !!
Much love & baby dust to all 
Xx