How Pregnancy Calculator works? 

You are pregnant, may be your doctor informed you the help of a pregnancy calculator. Now, it may be eager to know your due date. Nevertheless, some of you might be curious about how they know exactly when your bundle of joy is about to come! It’s a variety of methods to calculate the date of maturity. 

Last menstrual period (LMP) Method 

This is the standard method. Adding 280 days to day one of the last menstruation. This method is a classic 266-day period of pregnancy plus 14 days. The latter is the time of the first day of menstruation until we were ovulated. However, this calculator pregnancy may be wrong, as the assumption is that you ovulated 14 days after the beginning of the menstrual period and your soiled are exactly on that day. 
Basal body temperature and Lutenizing hormone (LH) 
This is another pregnancy calculator. And keep a check on your basal body temperature or upset, and LH. This points to the emergence of ovulation, the time relations, and the date of fertilization. If you are unsure of your date of fertilization, then simply have to add 266 days to get your due date. 

Naegle’s Rule 

This is a faster way to know your due date. Many doctors follow this pregnancy calculator. It takes into account from the first day of the last period with the standard during pregnancy. If you know the date, just count back three months from its date and add 7 days for this. You will get your due date. 

Ultrasound 

The ultrasound test, sound waves are used to create your baby picture. When you are in the first trimester, your doctor May ultrasonic test for assessing the age of your baby. On the basis of that, because of its date can be calculated. 
Remember, there is no accurate way to calculate the date of delivery. Mostly, they are calculated on the basis of average prices, therefore, they are hardly precise. She has taken medical experts who, on average, a baby remains in the womb for about 40 weeks. However, pregnancies May last week or two earlier or later than that. 
To get to some statistics, which found that about 80 percent of mothers deliver within 10 days from the date of delivery, and their 10 percent delivered in less than 38 weeks. There are about 8 percent of babies that were born after 42 weeks. Quite a long stay in the womb! 
All that May be due to date, forget to take care for the accuracy of pregnancy calculator.