BBT Chart Help

Hey ladies. This is my first time ever tracking my bbt. I thought I would just test it out this month to see if I could understand it before committing to it fully next month. I started late (a few days before ovulation) thinking that I would get at least 5 days in before I saw a spike ...

According to the app I was supposed to ovulate on the 18th. However, my spike came on the 16th. Does it look like I ovulated around the 15th, or could my spike still be coming?

Thanks for any input!