Obvulatuon? Daysy?

Kenzie • 👰🏻💍09/23/2017 Dog Mom🐶🐶

So daysy shows estimated ovulation on CD15 and I had too much to drink on CD17 and didn’t temp. I’m not understanding why I got a Green Day today and it’s guessing the next two days will be yellow then back to green. Can anyone explain this to me?

Did I ovulate on CD13?

I’ve been using daysy for 10 cycles now and trying to learn the Sympto-Thermal Method for about 3 cycles.