Ovulating?

Juli • Ttc #1 since June 2015. Laparoscopy to remove endo in July 2016. After 6 failed IUIs, we are starting ivf in April 2017!
Would you say I ovulated on the 27th instead of the 25th? My temp began to rise on the 25th but not to post-O temp? Or did I just rise slowly this month? I've never had a chart do this! And that's a late O for me.