When estimating the age of the fetus, the doctor begins counting weeks from the first day of your last menstrual period. The date of conception did not occur until 2 weeks later when you ovualted. This is why pregnancy is actually a total of 10 months not 9 as most people think.
calendar date 13 weeks ago
Ultrasound gives an estimate of the age of the foetus. At this stage of the pregnancy, it's quite accurate, but it's still only an estimate, and the date of conception could be a few days, even a week, away from the date 19 weeks and 2 days ago.
July
From the date the question was asked, 27th of August 2012, 40 weeks before that would be the 21st of November 2011.
30 may
No, you count back 38 weeks for the conception date, but don't forget this is just an estimate.
March 13th 2010? That would make your due date roughly December 18th
Based on a normal gestation period of 40 weeks the conception date was April 11th 2009.
I will assume you are talking about December 3rd 2011. If so, that makes your estimated conception date March 11th 2011. The estimated conception date is not always completely accurate. It is often wrong by a couple of days.
The approximate date of conception was May 7th Estimated on a gestation period of 40 weeks.
it is possible for the doctor to be off, but they can usually tell how far along you are by the size of the fetus.
When you have a dating scan the scanner compares the size of the fetus with the size of fetuses of known gestation. The gestational age assumes that the mother has a regular 28 day cycle and got pregnant 14 days before a period. the gestational age is calculated from this notional LMP. This is accurate in about 85% of cases. If you don't know your LMP and have been given an EDD/gestational age you need to take off 2 weeks to find an estimated date of conception. this website will help you. http://www.genetree.com/about/conception-calculator.asp
20 weeks would be the END of your 5th month.16 weeks is the END of your 4th month. Since almost no one knows the exact date of conception, there is always a 5-10 day latitude for you estimated date of conception [EDC ] .
June 19th 2010? Your rough conception date would be September 25th 2009, give or take a few days. However, it is very difficult to accurately say when conception occured. Therefore, I suggest speaking to your doctor, midwife or obstetrician about it because they can give you a better idea.
The estimated date of birth is September 28th 2009
To calculate conception you can go from the first day of your last period and add two weeks eg if your last period was on the first of the month then conception would have taken place at around the 15th . If you do not no the first day of your last period but no how many weeks pregnant you are then count back and minus two weeks eg if you are seventeen weeks on the 2nd of September go back on the calendar 15 weeks this will give you a approximate conception date
As of September 19, 2008 (this Friday), you should be 8 weeks along. Gestation is calculated (at first) by counting forward from the first day of your last period, and date of conception is typically assumed to be 14 days (2 weeks) after that date. A more accurate date can be given by the Sonographer at your first ultrasound, by measuring the size of your fetus.