When to test

Charlene
Hi
​I'm a little confused on when I should take a test. I came off the pill on August 2nd and had my first AF on September 1st which lasted untill September 5th. Glow said my AF was due last Friday but as it didn't come on the chart I clicked AF as late and it just keeps movin the day forward two days. I did a test in Sunday 28 sep and it was negative. When should I test again? Thank you so much