Ovulation help?!

Hey guys, so this is my first time taking an ovulation test and the line is not quite as dark as the control line. Since this is my first time ever taking one I'm not really sure what it means. I know that it needs to be just as dark or darker to be considered a positive. However,  since it's a slightly bit lighter does that normally mean that I'm about to start ovulating or that I have already ovulated and my levels are decreasing? I read online that some women do not have a line at all after they ovulate so I'm unsure. Also, how soon should I retest and how soon should I have sex? Thanks ladies ☺️❤️