Temp Gurus, I need you!

Hi, I'm TTC#2. This is my second cycle, I have been using opks (both wondfo and digital) and this month have started temping too.

Due to ds1 sometimes waking in the wee hours, I take my temp around 2-2:45am because that's the only time I'm usually sure I can get a solid 3-4hours. I also had a cold earlier this month with a low fever so my chart looks really funny.

Anyway, I got my Peak digital reading evening of cd14, and a clear positive wondfo opk morning of cd15. It was negative by evening. Had ewcm cd14 & 15, turned to creamy on cd16 & cervix closed right up from being very open cd13-15 (sorry tmi). But my temp didn't rise until yesterday morning, cd17. So my question is - when did I most likely ovulate? Cd15 or cd16? Is it possible I O'd on cd15 but it was later in the evening and that's why I didn't have a rise on cd16?

Thanks if anyone can give insight!