A 30-day pregnancy with a short menopause usually does not show any obvious early pregnancy symptoms. If the menstrual cycle is regular and ovulation occurs in the middle of two periods, 30 days of pregnancy refers to 30 days of menopause and about two weeks after fertilization. During this period, most women do not yet experience obvious early pregnancy reactions, such as nausea, vomiting and other gastrointestinal discomfort. This is because during this period, the level of human chorionic gonadotropin in the blood does not rise too much and the woman’s body is not sensitive to the reaction. The hormone level will rise significantly around 40 days of pregnancy, and there will be obvious early pregnancy reactions and cold-like symptoms such as general weakness. There are also a few women who do not respond significantly to the increase in hormone levels in their bodies and do not experience early pregnancy symptoms.