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Because women were falling pregnant before midwives knew about the science of conception and implantation, the only date anyone knew for sure was the date of the LMP (last menstrual period). Also, just because you have sex on a day, does not mean that you conceive on that day- sperm take several days to travel to the ovum, and so the actual date of conception will remain a mystery. When you have your first ultrasound scan, you will be dated based on the size of several parts of the foetus' body, include head circumference and femur length. This will give a much more accurate indication of gestational age, and if you work backwards, you can calculate the date of conception- remember though that the act of love making would have happened a couple of days before. Hope this helps! Aj :)

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18y ago

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The first date of my last period was on 12-18-08. When was my conception date?

The approximate date of conception was January 1st


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Conception dates do not depend on the length of your period. Your due date is based on the first day of your last period. Your baby was actually conceived about 2 weeks later.


Do they back date ultrasounds to the 1st day of your last period or your conception date?

Most doctors revert back to the first day of your last period.


How is it that the doctor said your conception date is the same as the first day of your last period?

That is unlikely but possible.


Is conception after your last period or before?

conception occurs appr 2 weeks after ur last period not before because if you got pregnant before your period your period would not come on conception occurs appr 2 weeks after ur last period not before because if you got pregnant before your period your period would not come on


If your first day of your last period was 23rd May when did you conceive?

The approximate date of conception was June 6th


Last period 22 August conception when?

The approximate date of conception was September 5th


If you conceived on June 20Th when is my due date?

March 13th 2010? That would make your due date roughly December 18th


If the first date of your last period was August 13 2009 when did you get pregnant?

The approximate date of conception was August 27th


If you had a period on October 28 when was conception?

if my last period was on october the 28th when did i get pregent


Do you always have a last period after conception?

No. When you get pregnant, periods stop.


If the first date of your last period was May 6th when is your due date to conceive?

The approximate date of conception is May 20th