I want to start by saying that I have very irregular cycles. They can range anywhere from short (20 days) to long (40+ days) and it’s very common for me to have light spotting for a few days between periods. This has resulted in me having a VERY difficult time determining when I actually O. I have yet to get a positive OPK and I’ve been testing for about 4 months. The lines are usually light and will get a little bit darker as I get closer to my predicted O but they are never dark enough to be considered positive. What am I doing wrong? Has anyone else had this problem? can offer any tips or tricks to help??