1. How long does it take to get pregnant to have any reaction? Pregnancy response refers to a series of physiological changes and symptoms that occur in a woman\’s body after conception. These reactions can be physical, such as breast tenderness, nausea and vomiting, etc.; they can also be psychological, such as mood swings, irritability, etc. Different women may have different reactions during early pregnancy. 2. How long after conception does the reaction begin? After conception, a woman\’s body begins to change, but these changes are not immediately noticeable. Generally speaking, some initial reactions will not begin until about 2-4 weeks into pregnancy. at this time