Opk help

Yesterday I had a lh surge on my first opk test and then in the evening it had definately faded and was lower than the earlier test, so I took this as my surge had happened and was on its way back down. So ovulation day would be today....

Today I've tested and gotten an even stronger positive, but my app hasn't adjusted ovulation to tomorrow... do you think ovulation will occur 24hrs from now????

This is my second month using opks so im fairly new to it all, so any advice or thoughts greatfully received.

We BD yesterday and this morning so hoping we're in with a shout this month...