Heparin
Heparin is an anticoagulant (substance that stops blood clots) discovered by Jay McLean and William Henry Howell. It is generally injected under the skin or into veins. As of now it seems safe to use on pregnant people. It is identified as a glycosaminoglycan (long polysaccharide (the stuff that cells are made of) chains consisting of long repeating disaccharide chains.