My menstrual cycle is 40 days. It’s regular and has been like this for many years. How does it affect my pregnancy? In gestational age, ovulation, implantation and due date?

No effect on preg. Once you get pregnant the length on your menstrual cycle has no effect on pregnancy. The due date will be first calculated by your last period. Your first sonogram will confirm or change the due date. Ovulation occurs 14 days before your next period. .