Blood thinners used during pregnancy, labor and delivery

Studies show that heparin, another blood-thinning medication, is safe to take while you're pregnant. Some pregnant women with atrial fibrillation are prescribed injections of heparin to prevent blood clots.

Even when taking blood-thinning medications, you're still at risk of developing blood clots during pregnancy. Watch for signs or symptoms of blood clots, such as chest pain, shortness of breath, leg swelling or warnings of stroke, including changes in vision, trouble speaking and numbness in the face, arms or legs. Contact your doctor immediately if you notice unusual signs or symptoms.

Heparin and other blood-thinning medications do increase your risk of major bleeding. If you notice any bleeding, contact your doctor. Blood-thinning medications are usually stopped during labor and delivery, unless you're at very high risk of blood clots.