Due Date Calculation?

I have this question, this may sound weird.





The first day of my LMP was June 1st 2007 (06/01/07)


I believe I got pregnant on the 14th or 16th of June.


My doctor first calculated my due date as march 9th from the LMP date I gave her.


When I went for my first IV ultra sound, she said my due date wasn’t correct.





She then tells me that the due date is March 21st and my LMP started on June 15th.


Now I know she is an excellent OB-GYN with over 20yrs of experience, but I know when I had my last period!!


Could she possibly be miscalculating? I am currently working and I intend to work until 2weeks before my due date. But if she calculated wrong, I don’t want to be at work when I go into labor….


Anyone with similar experiences? Any advice appreciated!

Due Date Calculation?
First day of last menstrual period: June 1, 2007


Estimated date of conception: Friday, June 15, 2007


End of 1st trimester (12 weeks): Friday, August 24, 2007


End of 2nd trimester (27 weeks): Friday, December 7, 2007


Estimated Due Date: March 7, 2008





You are 17 weeks, 5 days pregnant





Go by your last period. Same thing happened to my mom. The doctor said she was further along than what she was. She knew when her last period was. My god she had had 6 kids before my brother she knows something about counting back and finding out when your due.


Well when it came time to have my brother she knew she was due in January NOT febuary like the doctor said, they even gave her drugs to stop labor but they couldn't stop it cause it was time to have him. Don't listen to your doctor, you always go by your last period. Maybe you should get a different doctor.


Good luck
Reply:go by your period if you are sure of date. your due date would be march 9th.
Reply:The most accurate due date would be the ultrasound. They measure the baby and can give you an accurate date depending on the size of the baby.
Reply:Well, I am pregnant and my due date is March 14th. My lmp was June 8th. My u/s confirmed that. Yet, your due date is just an estimate. It is more like a due month. Maybe get a second opinion.
Reply:Personally, I don't know why doctors still give due dates. They should give a "due range" or something. Calculating due dates is a very imprecise science. Its possible that you miscalculated your ovulation date and conceived later in your cycle than you thought, thus pushing your due date further back. Its also possible that the original date is correct and your baby will just be a little smaller than average. Generally, an ultrasound is going to more precise than going off your LMP - especially if its early in your pregnancy. I would wait to take off work until two weeks before the March 21st due date. There's no gurantee you won't go into labor before you stop working, but that's my suggestion.

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