Amniotic Fluid Problems: Hydramnios and Oligohydramnios Too much or too little amniotic fluid around the fetus can cause problems. These include preterm labor, birth defects, and underdeveloped lungs in the fetus. Anemia in Pregnancy Doctor appointments and baby showers aren’t the only things that can tucker you out when you’re pregnant. Anemia is a condition that also can make you feel fatigued. Find out what you need to know to safeguard yourself. Bleeding in Pregnancy: Placenta Previa and Placental Abruption Bleeding may occur at various times in pregnancy. Although bleeding is alarming, it may or may not be a serious complication. Heart Disease and Pregnancy In pregnancy, blood volume increases greatly. This extra fluid puts an increased workload on the heart and may cause problems for a woman with heart disease. Post-Term Pregnancy A pregnancy that lasts more than 42 weeks is considered post-term. Post-term pregnancy is associated with longer labors and the need for cesarean delivery. Rh Disease Rh disease occurs during pregnancy when there is an incompatibility between the blood types of the mother and baby. Sickle Cell Disease in Children Sickle cell disease involves the red blood cells, or hemoglobin, and their ability to carry oxygen. Asthma and Pregnancy With proper asthma management and good prenatal care, most women with asthma can have healthy pregnancies.