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.
During your pregnancy, you're likely to feel tired much of the time -- though this fatigue may be particularly noticeable after you eat, particularly in the first and third trimester of pregnancy.If you experience tiredness after eating, there are a few things you can do to try to avoid or manage your symptoms.regnancy Fatigue. Fatigue during pregnancy is very common, particularly during the first and third trimester. Heidi Murkoff and Sharon Mazel, in their book What To Expect When You're Expecting, explain that hormones are to blame in early pregnancy, and the weight of your growing baby causes fatigue later on.