Water may break in 4 months of pregnancy. When a pregnant woman is 4 months pregnant, there is amniotic fluid in her uterus. If you do not pay attention to more rest, affected by various external factors, trauma, severe vaginitis and other reasons, it may lead to contractions, premature rupture of membranes and miscarriage. Pregnant women must pay attention to more rest during pregnancy, avoid strenuous exercise, also pay attention to try not to have intercourse during pregnancy, pay attention to keep the perineum clean and hygienic, so as to avoid secondary vaginitis, cervicitis and other possible. Pregnant women during pregnancy should pay attention to regular maternity checkups, especially pay attention to do a good job in the examination of malformation, if at any time to find problems at any time to deal with. During pregnancy, if there is abdominal pain, vaginal redness, fluid, etc., must go to the hospital as soon as possible.