Super confused please help!

Ashleigh
I am so confused. So I thought I had been ovulating/fertile and I thought there were the same thing... Are they not. Here is why I got confused. ​here is my calendar and it says I'm fertile, which I thought was when I should be having sex
​Then I got this notification    
​I'm ovulating and that the most important time to have sex is the 23rd? I'm confused.