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.
Cramping During Early Pregnancy. Mild cramping in early pregnancy (about 5 to 6 weeks) can be completely normal. Many women acknowledge having mild cramps in the first trimester, without any serious consequences. However, cramping during pregnancy may be considered a severe concern if there is consistent abdominal pain. Here we have listed both the harmless and serious causes for cramping early into pregnancy.