When did I ovulate?

Bri • Newly married and trying to conceive our first baby! My husband and I have been together for 11 years and are excited to see where life takes us!
Alright ladies so my cycle has been kind of wacky this time around. My period should have started around 12/31. It never did. I got multiple negative tests-called my doc & she told me to wait until my next period.. If it doesn't show- then schedule an appointment if I keep getting negatives. My next period should be around 1/23. Doubt it's coming.
So randomly I did a clear blue opk and got a positive on 1/16! Followed by EWCM. So my question is should I count the 16th as my ovulation day or a few days after or before?
Also, I don't have a projected date for my next period..when should I test again for pregnancy?
Thanks all!!!!!