If the pregnancy is not related to any pathological conditions, then it is completely safe to have intercourse until late in the pregnancy. The amniotic sac and the strong uterine muscles protect the baby from any mechanical damage, whereas the thick cervical mucus keeps it from infections.
However, there are certain conditions in which it is recommended to avoid vaginal sexual intercourse. These conditions include: placenta previa (a condition when the placenta is attached to the inner opening of the cervix through which the baby is supposed to pass when delivered), premature labor, unexplained vaginal bleeding or abnormal discharge, abdominal cramping, and certain sexually transmitted diseases.
You might want to visit your gynecologist and check if there are any conditions present that would prevent you from having vaginal sexual intercourse. You might also consult with the gynecologist or a midwife what other conditions might be a cause to avoid sexual intercourse.
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