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.
That might be because your growing baby requires extra energy. Sometimes, it's a sign of anemia (low iron in the blood), which is common during pregnancy. Recommendations: 1  Get plenty of rest; go to bed earlier and take naps. 2  Keep a regular schedule when possible. 3  Pace yourself. 4  Balance activity with rest.