Get some perspectives on your due date, or "EDD" (estimated due date), as well like to call it. Read what a midwife, a doula, an OB, a labor nurse, an acupuncturist, and a pediatrician have to say about. it And in case you didn't know already, only about 5% of women give birth on their due date. The rest of us tend to naturally go somewhere from week 37 (full term) to week 42. There are exceptions to this, of course - as always, with birth. My best advice on the "due date" situation is to consider it your due month, and when people ask you when you are due, you give them the month, not the date :)
Read the article on due dates from Well Rounded NY here.