It is actually quite rare that you will give birth on your due date.You should only use your due date as a guideline, such as “I am due sometime around the end of June”, or “I’m due near Christmas”.

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However, you should try to figure out the date of your last menstrual period, since this is the most accurate way to know when your due date will be.

Why do we figure out due dates from the date of last menstrual period?

This is a good way to keep you from stressing out about your due date.

Just remember to use it as a basic guideline, and not a rule.

These ultrasounds came in handy the next two pregnancies as well.

We luckily “caught the first egg” in both cases, so I had no last menstrual period to use in calculating a due date.A recent article explained that doctors are now going to be using first trimester ultrasounds to determine due date in the majority of pregnancies.Earlier this week the American College of Obstetricians and Gynecologists (ACOG) met with the American Institute of Ultrasound in Medicine and the Society for Maternal-Fetal Medicine to set new guidelines for due date determination. James Goldberg, vice chair of ACOG’s committee on obstetric practice, stated, “Some studies suggest up to 40 percent of pregnancies would have dates changed based on [a] first trimester ultrasound.” This difference is because most women do not know the day they conceive and the 40 week rule-of-thumb is based on a 28 day cycle, which is not always a good guideline for women with irregular or longer cycles.When I went to the doctor I had no idea what to tell them when they asked how far along I was.Because of this, we did an ultrasound and a due date was set.It seems like there are just too many other variables that make figuring due dates out any other way harder and more difficult to chart.