If you tell me that you are planning to conceive a baby and you are not worried about when does morning sickness start and end, I shall be convinces that you are a novice to pregnancy matters. This is usually the first question that arises in the mind of every woman who gets pregnant since this is slightly perplexing although anticipated phase of pregnancy. The morning sickness starts mostly during the fourth week. At the most it can get delayed to sixth week which is the most common average week when women can experience vomiting and/or a feeling of nausea.
As far as the end of this ordeal (it is nothing less than an ordeal) is concerned, even that varies from woman to woman. Some have a tough but short while others have a comparatively easy time but for a longer duration. This is fundamentally a change that your body goes through in order to prepare it for conception of a baby. During pregnancy the female body is prepared to accommodate a human life and the segment of morning sickness helps you get rid of all that serves on purpose on this mission for your body. Clearly, it is a blessing in disguise.