Estrogen and progesterone have the effect of dilating blood vessels during pregnancy, and dilating blood vessels generally cause a slight drop in blood pressure, so if a pregnant woman has low basal blood pressure, she can show hypotension during pregnancy, and this hypotension usually does not need special treatment. The main attention is not to fall because of hypotension when changing position, for example, when standing up from bed. If you fall, it may lead to the appearance of serious complications such as placental abruption, which can seriously threaten the safety of the mother and the fetus and therefore needs to be taken seriously.