HI Sarah, Have you been testing continuously? If so and you haven't noticed any great variation in the colour of the second line I would definitely keep testing. It can be helpful to test twice a day. Not everyone will have a positive that lasts for a couple of days - I certainly never have had that even on clomid but as you know I have successfully conceived. This cycle I got a neg at around 1230pm a neg around 5pm and a positive at 8.30pm at night. By the next day at 11am the line was still very dark but wasn't a true positive any longer. So, you can see from that that it can be easy to miss the surge.

I have evrerything crossed for you Sarah...