The first indicators of a twin pregnancy Twin pregnancy symptoms are identical to those of a singleton pregnancy, but more intense and occur earlier in the pregnancy. This is due to greater amounts of the pregnancy hormone, human Chorionic Gonadotropin (hCG), earlier in a twin pregnancy. HCG is also why monitoring your urine for hCG can tell you how far along you are in your pregnancy. Some women may not feel sick yet with a twin pregnancy, but they are still producing more hCG which can lead to some serious complications if left untreated. It's important to see your doctor at least once per month for blood tests to make sure you're healthy and there are no problems with your baby. Women with multiple pregnancies need special attention from doctors to ensure that both babies are growing properly and receiving adequate care. Physicians may want to do genetic testing on tissue from one of the babies or carry out an autopsy to determine gender and birth weight. This information can help predict what kind of health issues each child may have later in life. Women who have had more than one baby should use extra caution when trying for another child. Their chances of getting pregnant again after having multiple babies are only about 50 percent. In fact, many women don't reach this stage of fertility until after having three or more children!