Ovulation Enigma!!

Need your thoughts ladies! I had ovulation cramps last Wednesday through Friday, had positive OPKs on Thursday and friday, and EWCM from Wednesday thru Sunday. However, I see no temp spike, or much of a fluctuation in temperatures on my BBT chart.
​Is it possible that I didn't ovulate this month? Despite all the signs above (isnt mittleschermz/O pains a sure sign of ovulation?) ?
​Any thoughts are much appreciated :)