It is normal to still have nausea and vomiting at 13 weeks of pregnancy. After pregnancy, the hormone levels in the body will be very high, especially the estrogen and progesterone levels will be very high. These hormone levels will act on the gastrointestinal tract and cause a series of discomfort in the gastrointestinal tract, which can lead to spasm of the smooth muscle of the gastrointestinal tract. Many people have symptoms such as vomiting, nausea and dry heaving, which are all normal early pregnancy reactions. This reaction starts at a different time and lasts for a different period of time for each person, with most people starting to experience early pregnancy reactions from 5-6 weeks after menopause. Most people will continue until 12 weeks, which is about 3 months, when this symptom will slowly decrease or disappear. This is because individuals have different body types and different hormone levels in their bodies. Some of them will last until 16-18 weeks, and some of them will last for the whole pregnancy because they are particularly weak and have special anxiety and depression during the whole pregnancy. It is normal to be 13 weeks pregnant and still have nausea and vomiting.