Can Pregnancy Nausea and Vomiting Occur in the First Week?

One week after ovulation and sexual intercourse, which is considered as the first week of pregnancy, symptoms such as morning sickness and nausea typically do not appear. Generally, during the first week of pregnancy, hormone levels in the body are relatively low and have not yet increased significantly, so early pregnancy symptoms such as morning sickness and nausea are usually absent. Early pregnancy symptoms generally emerge around the 40th day after the last menstrual period, when estrogen and progesterone levels rise markedly, accompanied by a rapid increase in human chorionic gonadotropin. This may lead to gastrointestinal discomfort in pregnant women, causing nausea, vomiting, and other early pregnancy symptoms. However, the timing and severity of early pregnancy symptoms vary among individuals. Older pregnant women and those with a history of adverse pregnancy outcomes tend to experience earlier onset and longer duration of early pregnancy symptoms. During pregnancy, it is important to supplement folic acid to prevent neural tube defects in the fetus. Additionally, maintaining a pleasant mood, relaxing, and avoiding stress and anxiety can help reduce early pregnancy symptoms. In terms of diet, it is beneficial to consume light and nutritious foods such as eggs, carrots, kiwis, milk, chicken, and fish, which provide sufficient nutrients for the growth and development of the fetus.