I been doing some research online!! I found a site where a midwife had wrote about these test.. she said that sometime when you get a surge it could be too late for women in their 30's who are trying to concieve. She said sometimes you could get a surge on the same day that you are ovulation is taking place. I found the article very interrsting. Because I know on the day i received my surge reading on Clear blue digital I was having really bad cramping on one side of my abdomin. I knew then that I was ovulating that day along with a heavy CM. I'm hoping that I get a BFP next month since I BD a day before and on the day that I received my peak reading. I never knew that as you get older it has a great deal of when you ovulate.. just sharing some information what do you guys think??