Lack of energy. Morning sickness is most often experienced during the first 12-15 weeks of pregnancy. Though it is most apparent immediately after waking, morning sickness can and usually is experienced at any time of the day. In order to allow for normal growth of the fetus during pregnancy, major hormone changes take place in a woman's body. Progesterone and other hormones often cause involuntary muscles to relax, which in turn, slows movement of food through the stomach and intestines.
Blood sugar is also lower in early pregnancy months, which contributes to stomach upsets.
Just as each woman's body responds differently to pregnancy, so it is that each woman responds differently after applying preventative measures. Most doctors recommend a trial and error procedure, which may help to define what will work for you. Severe morning sickness can lead to Hyperemesis gravidarum, a condition characterized by severe vomiting and electrolyte disturbance. This condition is life threatening, and harmful to both mother and child. Any prolonged vomiting should be reported to your family physician at once.