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19-1-2009 - can someone tell me how to calculate correctly??

My mood while writing this blog: confused

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Can someone please tell me the right way to calculate my due date. I thought that It went by the first day of your last period. If i go to a website to calculate it and I put the last day of my period in it tells me that my due date is either Auguts 24ht or 25 which is my original due date but now she is telling me that it's September 4th because the size of the baby. Is she correct in saying this. Any way to solve this for me would be great and how to calculate correctly. thanks a bunch

nicole

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5 Comments on can someone tell me how to calculate correctly??


mammabjork - Thursday, 22 Jan
i was pushed back a week also.

mrs lady - Tuesday, 20 Jan
The ultrasound is most accurate...using the pregnancy calculator put in the due date your doctor gave you and that should be good.

shocked-over-3 - Tuesday, 20 Jan
This early in your pregnancy it's best to go by the ultrasound dates,since they are pretty accurate at this stage in your pregnancy (at least that's what I've heard and they were right on with both of my previous pregnancies) since development is changing at a faster pace right now...Once you are in your second trimester,although things change it is harder to tell exactly where you are,it could be a week off..Where at this stage it's usually within a couple of days.

It's hard to base your due date by your cycle unless you were tracking ovulation and know the exact date you ovulated..For example,with my first son I ovulated on day 12 of my cycle and with son #2 I ovulated on day 9...They say most women ovulate on CD 14 which isn't really true,since it's just an average.
I'd trust the ultrasound at this point :)

Best of luck!

lou83 - Tuesday, 20 Jan
On a 28 day cycle, you add 40 weeks to the first day of your last period (a pregnancy is 38 weeks but on a regular 28 day cycle women tend to ovulate 14 days after the furst day of their period, hence for those 2 weeks there is no baby so this is added on).

For people like myself who may have a longer cycle of 33 days (5 days over the norm), you add the 40 weeks to your first day of bleeding, but then add on the extra 5 days to give a delayed due date (due to the fact it is anticipated that I ovulated after 19 days not 14 days.

Problem with my cycle is that it was always irregular, being between 28 days and 35, so i'm pretty much having to wait for my scan to predict dates.

Hope this helps and is'nt too confusing x

Mandy Irish Mommy - Monday, 19 Jan
it goes by the first day of your last period,

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