Pregnancy lasts an average of 40 weeks, to understand the duration of pregnancy you can refer to the calendar of the weeks of pregnancy.

The calendar of the weeks of pregnancy is important to understand how long exactly a gestation lasts, that to know how many months of pregnancy the pregnant woman is at is a very simple calculation. Starting from the first week of pregnancy you can check the growth of the fetus and notice all changes up to the fortieth week when the due date is expected. Ultrasound is very useful to support the calendar of the weeks of pregnancy since it allows you to measure the fetus and thus estimate the period of gestation.

The pregnancy weeks calendar table is divided into three periods, namely the first trimester, the second trimester and the third trimester.

• The first month, which starts from the 1st day of the last menstruation up to 4 weeks + 3 days

• the second month, which starts from 4 weeks + 4 days up to 8 weeks + 5 days

• the third month, which starts from 8 weeks + 6 days up to 13 weeks + 1 day

The second trimester pregnancy week calendar includes:

• the fourth month, which runs from 13 weeks + 2 days up to 17 weeks + 4 days

• the fifth month, which runs from 17 weeks + 5 days up to 21 weeks + 6 days

• the sixth month, which runs from 22 weeks + 0 days to 26 weeks + 2 days

The third trimester pregnancy week calendar includes:

• the seventh month, which runs from 26 weeks + 3 days up to 30 weeks + 4 days

• the eighth month, which runs from 30 weeks + 5 days up to 35 weeks + 0 days

• the ninth month, which runs from 35 weeks + 1 day up to 40 weeks + 0 days

Each week of pregnancy has its own specific characteristics, the first trimester is the period in which pregnant women are most afraid that pregnancy may have complications, the second trimester is considered by pregnant women to be the most beautiful period, the third trimester of pregnancy instead is the period considered most tiring by pregnant women due to changes in the body and weight gain.