First, read the English article below.

Morning sickness can strike early in a pregnancy. Despite its name, morning sickness doesn't just happen in the morning. You may have an upset stomach any time of day. Your may also experience some vomiting. This symptom can strike as early as 2 weeks after conception. You may start noticing you suddenly don't like certain foods or smells. It will come out of the blue, and you may have been just fine with them before. In fact, these foods or smells may make you nauseated. Often, you will find you are much hungrier if you are pregnant. If you notice you are eating more than normal and still find yourself hungry, you may be pregnant. Some women describe this symptom as a constant hunger. Sometimes, women experience having a metallic taste in their mouths. This symptom is especially prevalent in the early stages of pregnancy. Like food aversions, you may start craving certain foods. Of course, everyone gets a craving for a certain food every now and then. Nonetheless, pregnancy cravings tend to be more intense. Sometimes, you may notice you get out of breath more quickly in the early stages of pregnancy. Usually, this symptom is mild. However, if you do notice this symptom, it's definitely a sign you should see your doctor. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Để ý đến hiện tượng ốm nghén. Để ý xem có mùi hoặc đồ ăn nào khiến bạn cảm thấy khó chịu không. Để ý xem bạn đói đến mức nào. Xem mình có cảm thấy vị kim loại không. Xem bạn có thèm gì không. Kiểm tra vấn đề về hô hấp.