Received an email from babycenter.com.
Thank you for the explanation : )
"You're 40 weeks pregnant – your baby is due!
After months of anticipation, your due date rolls around, and... you're still pregnant. It's a frustrating, but common, situation in which to find yourself. You may not be as late as you think, especially if you're relying solely on a due date calculated from the day of your last period because sometimes women ovulate later than expected. Even with reliable dating, some women have prolonged pregnancies for no apparent reason.
You still have a couple of weeks before you'll be considered "post-term." But to be sure your baby is still thriving, your practitioner will schedule you for testing to keep an eye on her if your pregnancy continues."