Pregnancy weeks are calculated from when ?

is it from the first day of the last mestrual cycle or from the day of ovulation

Answers:
Starts from the 1st day of Last Menstrual Cycle and not the day of ovulation.
This helps to date the pregnancy more accurately as most women are unaware of their ovulation date.
1st day of last period
from the frist day of your last period.
Well it's the first day of your period but when you go to the hospital they then date you from the scan so neither really
The first day of your last period (so you're actually counted as pregnant before you got pregnant!).
it is from the first day or your last period
I believe first day of last period, but you arcutually pregnant for 9 1/2 to 10 months.
since the day you get the sperm shot i think.
First day of menstual cycle.
Its from the first day of ur last period!
I think it is from conception.
many think its from your last day of your last period, but your doctor will ask you when u last had sex before you missed your period and that may be a factor also
I think it is the last day, but it does not really matter which, your talking days which don't make a lot of difference when you are looking at 40 weeks (or 38,39,41,42.)
The first day of your period. Cause they cant pin point when you ovulated.
from the frist day of your last period.
They calculate it both ways.the ways you just mentioned. I think most doctors calculate from the first day of your last period. That's why *technically* you're pregnant for 9 1/2 months. :)
from your last period.
there is no true way to tell when exactly you ovulate, so it's from your last period.

they used my last period even though i knew the exact day that i conceived. that's why i'm pretty sure my due date will be about a week later than what the dr. said;)
the first day of your last period
1st day of your last peiroid
www.ivillage.com/co.uk will help you create a pregnancy calender to show you all of the information you want to know
the fisrt day of your last period so basically when you came on!
Its not the day of ovulation or the day you had sex. don't know why just is
most doctors calculate it from the FIRST DAY OF YOUR LAST PERIOD! 40 weeks

unless you can exactly pinpoint your ovulation, then you can count it from there! 38 weeks
it is from the first day of your last period
From the first day of your last period. Then to work out your due date add on seven days from the first date of your last period and count on nine months, this will give you the date your baby is due!
1st day of your last period
Its from the 1st day of your last menstrual cycle. (the 1st day of your last period). In reality conception happens later.

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