Calendar keeps adjusting!

After I get my first positive opk, I continue to test twice a day and log those positives. The problem is, all my fertility apps move the ovulation days! The ones that move the O day up is fine (because we BD-ed to the first positive opk!), it’s the one that moved the O date back by a day that is problematic- now it looks like we didn’t BD enough or close enough to ovulation! I have to say I am spent... so not sure how we can muster another round... any advice, suggestions, own experience? Thank you!