I decided this month to be a bit more pro-active in ttc so bought the Clearblue digital ovulation testing kit from Boots. I have been testing since last Thursday (which is right according to the instructions) and I still don't have a positive reading. My period is the standard 28 days and always has been - now I'm beginning to worry that I am not ovulating?! My OH says to throw it away as it's obviously not right for us and it's causing me undue stress. Has anyone else had a similar experience with this product??