I’m not sure when I ovulated

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I am not sure when I ovulated, we didn’t BD very much but I had the egg like discharge the 10-12th and very very light spotting on the 11th but how my calendar is set up I should have ovulated around the 17th, what would you guys say? I don’t really have a regular period sometimes it will come 6 weeks late sometimes will come in 4 weeks. I still haven’t had it and supposed to show in 3 days and all my test are BFN I’m confused! Is there still hope??