Possible ovulation today with no LH surge?

Em

Hi ladies - I’ve been tracking my LH with OPKs and I’ve yet to get a positive test, yet by tracking my CM and position, it feels like ovulation is about to happen (also getting a little crampy). I’m going to BD today and tomorrow to be safe, but has this happened to anyone else before? Ovulation and no LH surge? Does my chart look promising for ovulation in the coming days? Thanks!