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.
It's common to feel tired, or even exhausted, during pregnancy, especially in the first 12 weeks. Hormonal changes at this time can make you feel tired, nauseous and emotional. The only answer is to try to rest as much as possible.ater on in pregnancy, you may feel tired because of the extra weight you are carrying. Make sure you get plenty of rest. As your bump gets bigger, it can be difficult to get a good night's sleep.