When did I ovulate???

This is my first month charting so I’m super new to this. I’m a little confused as to when I may have ovulated. Did I ovulate on day 11th or on the 14th or 15th? I’ve been thinking the 15th but when I really looked at it it had been slowly going up since the 11th. Give me your best estimate. I never did have EWCM, which I usually do, but I just watery through most my fertile days. I got my thermometer later than I thought so that’s why my temping starts on CD 10.