What are the symptoms of early pregnancy? After pregnancy, hormonal levels in women undergo tremendous changes, causing the body to produce a series of reactions called early pregnancy reactions. Early pregnancy reactions include a series of physical and psychological changes such as nausea, vomiting, breast tenderness, fatigue, headaches, and mood swings. Some women find these changes difficult to accept, while others feel that this is one of the important signs that they are pregnant. But how long after pregnancy does it take for early pregnancy symptoms to appear? Early pregnancy symptoms appear