Carbon dioxide is a pure substance. A pure substance can be an element or a compound. Carbon dioxide is a pure compound, consisting of two kinds of atoms that are bonded together. An element consists of merely one kind of atom. For example, oxygen is an element.
For Downâs syndrome, a blood test called the quadruple test is available from weeks 14-20 of pregnancy. For Patauâs and Edwardsâ syndromes, you will be offered a mid-pregnancy scan that checks for physical abnormalities.
Fatigue During Pregnancy. Fatigue is a common symptom during pregnancy. Some women may feel exhausted throughout their pregnancy, while some may hardly feel tired at all.Although experience with fatigue tends to vary, most women will feel more tired than usual during their pregnancy.Fatigue during pregnancy is most common during the first trimester.ome women may feel exhausted throughout their pregnancy, while some may hardly feel tired at all. Although experience with fatigue tends to vary, most women will feel more tired than usual during their pregnancy. Fatigue during pregnancy is most common during the first trimester.