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.
Mom Answers. I have had continual but mild cramping for several weeks now and I am five weeks pregnant. It it normal to feel this way as long as it's not painful and you are not bleeding. Also, your hormones are just causeing the uterus to prepare itself for the new baby. Also, early pregnancy bloating and gas can add to the crampyness. I have also heard of sharp pains that occur now and then and that they are normal also--as the uterus is stretching. Most of us at 5-6 weeks have not been to an appointment yet but don't get yourself worried. posted 06/17/2008 by a BabyCenter Member.