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In obstetrics, it is customary to divide pregnancy into three trimesters. Each of them has its own characteristics and characteristics.
• The first trimester lasts 13 weeks of obstetric period.
• The second trimester starts from the beginning of the 14th week of gestation until the end of 27 completed weeks.
• The third trimester begins at 27 completed weeks and ends with childbirth.
As a rule, when numbering trimesters, Roman numerals I, II, III are used.