I pretty sure O'd on the 14th of Feb. I had a peak fertility on the 13th according to clear blue OPK. BD happened just 30 minutes before testing. I felt some mild cramping and back aches last week but that's pretty much it. I don't really have any nausea and my breast feel totally fine (even though they get really tender a week or so before AF) I am a few days late for AF now, and I can't remember the last time I was late. I tested yesterday (17dpo) and got a bfn. Has anyone else experienced something like this???