How do you calculate your gestational age?

Many pregnant women are ignorant of the correct method of calculating the age of their pregnancy, and some of them do not even know any way to calculate it. Today in Ana Salwa, we will present to you, pregnant woman, a very easy, very, very accurate method, confirmed by hundreds of international studies, old and recent, called the method or rule of Nigel (Naegele) in relation to The first to apply it to calculate the gestational age and the expected date of birth.
The method is: the first day of the last period + 9 months and 10 days = the expected date of delivery.
Example: If the first day of your last period is March 10 (10/3), then your expected due date is December 20 (20/12), and every 20th of the month begins a new month.
Second example: If the date of your last period is October 7 (7/10), then your expected date of birth is July 17 (17/7) and every 17th of the month begins a new month.
It is preferable to calculate your gestational age in months, not weeks, for ease.