Random Question

Roisin • POSITIVE VIBES ONLY!! ✌🏻️
I'm wondering could any of you ladies help me figure out my ovalation days were?! 
I finished the pill round the end oct/Nov can't really remember. 
I got my period 13-Nov-15 it finished on the 17-Nov-15 just wondering roughly when my ovalation days were? I then got my period on the 13-dec-15 it came on its due date.