Thanks ladies, yeah when I see photos of actual positives I can understand where mine are lacking! I've been temping too and so far all temps are either 36.4 or 36.5oC. I usually only test once a day around 12:30 which is my lunch hour. The opk are so confusing as sometimes both lines look as dark as each other when fresh but as time goes on, it's quite clear the test line isn't as dark as the control line. I BD every other day anyway, I'll just have to see when AF arrives and look back at my tests to see if I can see a link!