First off, don’t stress if you’ve gone past your expected due date, i.e. you’ve been exactly 40 weeks pregnant. While the pregnancy due date is calculated as 40 weeks from your last period’s first day, a normal pregnancy can be as short as 38 weeks and as long as 42 weeks.
Remember, due dates are not set in stone, so it could be that the due date calculation was a bit off or your baby isn’t ready to come out yet.
If your pregnancy goes into 41-42 weeks, it's called a late-term pregnancy. If your pregnancy is 42 weeks or longer, it is considered a postterm or a past-due pregnancy.
In such cases, try to be patient, consult your Doctor, and keep an eye out for labor signs.
Your Doctor may recommend inducing labor or coming in for weekly/biweekly visits and testing to ensure that your baby is healthy and developing properly.