The simple answer is that gestational age is calculated from the first day of the pregnant female's last menstrual period, while the conceptional age is calculated from the time of ovulation. In a normal menstrual cycle, the first date of menstruation reliably occurs about 14 days after ovulation, accounting for the two weeks' difference in gestational age and conceptional age.
And now for some background information. Both gestational age and conceptional age are terms used to describe the age of a fetus during a pregnancy, particularly the age at delivery. But as you've observed, they are off by two weeks, such that gestational age is about two weeks greater than conceptional age.
Gestational age is how much time has passed since the first day of the last menstrual period (LMP). Conceptional age is how much time has passed since conception (fertilization). Conception is presumed to have occurred on the day of ovulation. The difference in time between the LMP and ovulation is two weeks, which accounts for the two week difference in gestational age and conceptional age. While individual female's menstrual cycles vary by length, timing, etc., a female reliably begins her menstrual period 14 days after ovulation.
Conceptional age refers to the length of time since conception, usually measured in weeks. It is used to assess the stage of development of a fetus during pregnancy. Conceptional age may differ from gestational age, which is measured from the first day of the last menstrual period.
When the gestational age of an embryo is 12 weeks, then you are considered 14 weeks pregnant. The first 2 weeks of pregnancy is the week of your last period, followed by the week before your ovulation, therefore, as soon as your egg is fertilized you are already 2 weeks pregnant!
GA is gestational age which is how far pregnant you are. LMP is last menstrual period, which is the date of the first day. EDD is estimated dte of delivery (40 weeks from the LMP) The EDD may be changed if the ultrasound gestational age differs from the age by LMP by a lot.
11 weeks and 4 days
The gestational period is defined as the period of time from conception to parturition. The average gestational age for humans is 38 weeks.
To estimate gestational age clinically from the fundal height. Uterus palpable at pubic symphysis- 12 weeks At umbilicus- 24 weeks At xiphisternum- 36 weeks For every 4 fingerbreadth increase in fundal height from these landmarks, gestational age increases by 4 weeks.
All dogs have a gestation period of around 9 weeks.
About 3 or 4 days after a missed period.
6 weeks 3 days approx
No earlier than 39 weeks into the pregnancy.
after a 79 to 85 days of gestational process
4 weeks. You could see 2 gestational sacs