Ovulation

Girls I need help! I’ve been researching about ovulation and going to my gyno a lot more trying to get a better understanding about ovulation. My last period was sept 7-12. It says I started being fertile the 14-20. Ovulation date the 20th . I had sex on the 16th, 18th, and 19th. Is there any way that I could be pregnant? Is this app accurate when it comes to ovulation? I did a few days ago experience mild cramps. And then I started breaking out does this mean I’m going to get my period in 9 days like it says? I always break out tho but more so when I am about to get on and I’d had sore breasts too