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3 doctors weighed in: When during pregnancy should you stop laying on your back? 3 doctors weighed in Want a second opinion? At approximately 24 weeks you should avoid laying on your back for prolonged periods of time in order to avoid compression of veins (vena cava). In brief: 6 months.
This can increase your blood pressure and cause headaches and dizziness. In later pregnancy, the weight of your baby can squeeze the blood vessels in your legs, pelvis and lower body when you lie on your back. This can also make you feel dizzy and woolly-headed, as your blood pressure drops.