has ovulation occurred?

Jenn • 34. Married since 08-24-2013. MC 2015/04. D&C 2015/07. EP and loss of RT 2016/02. Still trying.....
Based on this chart, is it likely ovulation happened between CD 12&13 (Sept 19&20)? Normally I ovulate late (CD18-20) so this would be very early for me. 
Has anyone experience multiple temp spikes during their cycle, not just during ovulation?