No fertile days in September!

Amy • Stay at home mom. Just went back to work part time. beautiful girls. 9 and 2
Hi name is Amy. I'm a SAHM in south central PA. Today, the 29th, is my last green day! My period is Sept. 11th. So no green days in September. So weird! Next fertile week is October 1. My cycle length is 40, and period length is 7 days. Anyone else experience this. We are trying/not trying lol.