During pregnancy, women need to rest in bed, but there are no strict requirements for the sleeping position, relatively supine is most conducive to uterine relaxation, to avoid the formation of uterine compression or stretching, the most conducive to the preservation of the fetus. However, it is not necessary to take the supine position during the period of birth control, because if a long time to take a position, the body will certainly aggravate the sense of fatigue, so for women during the period of birth control, in the choice of sleeping position, more to take the supine position, when the body appears to be tired, you can adjust the sleeping position appropriately. Fertility preservation period need to use medication on time, for example, because the body of progesterone is low caused by the first trimester miscarriage, need to be used through the use of progesterone or other drugs to preserve the fetus, bed rest can only play a role in assisting the preservation of the fetus.