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: Fatigue can be a sign of PMS or pregnancy, though fatigue has many possible causes. During the latter stages of pregnancy, anemia can cause fatigue, but more often the cause is probably just a need for more rest! In some women, fatigue can be the very first sign of pregnancy. Since fatigue is so common, it is not a reliable sign as to whether you might be pregnant or not. PMS fatigue, like most PMS symptoms, usually gets better with the onset of the period. Fatigue that gets worse during the blood loss of the menses could be a sign of anemia. Fever: Fever is not a normal symptom of either pregnancy or PMS.