So frustrated

Alesha

I have a few different apps- Flo, this one and clearblue(<a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation app</a>). So Flo says next period will be the 20th, this app says the 19th and clearblue says the 16th. So which do I go by? Should I count from day of ovulation and take pregnancy test off of that date? I had my peak reading on the clearblue ovulation digital test on Sunday November 4th. I put that info in the other two apps and it puts ovulation the next day. I am beyond frustrated and confused 🤷‍♀️ any help or advise is SUPER APPRECIATED