Ovarian pain question 4 dpo

Courtney • 25. Newlywed since 07/27/2013. TTC #1 since November 2013
Hi ladies.. I'm hoping you can help me. I am 4 dpo. I am 99% positive I ovulated because of a positive opk and bbt spikes. I'm having a slight pain today in my left ovary. Does anyone know what this might be?