Interpreting OPK results

So yesterday (morning and night) I got positive OPKs. This morning I was negative. To me, that means the surge is over and the egg should be released. So I consider today the day I ovulate. Is that correct?

Having said that, I have inputed this information into my Glow data and the app is telling me that I ovulated yesterday. I assume that’s based on, say, my average cycle or whatnot. Is there a way to change it so that it says today is ovulation day (thereby changing all the DPOs)?