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The other way to calculate your due date is to use a pregnancy wheel. It’s very easy to estimate your due date if you have access to a pregnancy wheel. When you line up that date with the indicator, the wheel will display your due date. Luckily, there are ways to figure out your due date when you can't remember the first day of your LMP.
If you know you had your LMP during a particular week, your doctor can estimate your due date accordingly.
Gestational age, or the age of the baby, is calculated from the first day of the mother’s last menstrual period.
Since the exact date of conception is almost never known, the first day of the last menstrual period is used to measure how old the baby is.
Such measurements form the cornerstone in the assessment of gestational age, size and growth in the fetus.3.5 to 7 million cycles per second) are generally used for this purpose.They are emitted from a transducer which is placed in contact with the maternal abdomen, and is moved to "look at" (likened to a light shined from a torch) any particular content of the uterus.Gestational age is calculated from the first day of the mother’s last menstrual period and not from the date of conception.
The baby can be measured as early as 5 or 6 weeks after the mother’s last menstrual period.
For a woman with a regular period, conception typically occurs about 11-21 days after the first day of the last period.