Trying for baby #2 and I have been trying to track ovulation using opks. This is month number 3 and I've been using some cheap ones from Boots. I can never get a positive result even though I'm sure I'm ovulating! These strips require you to pee in a cup however I'm directly peeing on the stick. Is this where I'm going wrong? Does it really make a difference?! Any recommendations for opks you pee on?