"On beginning of week 3 of pregnancy, fertilization occurs. The fertilized egg divides until a solid ball of cells is formed. During the third week very few women realise that they have conceived and are pregnant. The three week pregnancy symptoms include:1. Food cravings: Craving for a particular or unusual type of food is a common pregnancy symptom. 2. Lower abdominal cramps: Due to the recent
Read more.... implantation of the egg in the uterine lining, women may experience cramping and spotting (implantation bleeding).3. Tender, swollen breasts and nipples.4. Nausea or ""Morning sickness"": It is the second most common symptoms of pregnancy after ""food cravings.""5. Fatigue and tiredness: Increase in the level of progesterone leads to tiredness and fatigue.6. An elevated BBT(Basal Body Temperature) curve for more than 15 days without a menstrual period.6. Frequent urination: It is the most common symptom during pregnancy.7. Mood swings.8. Headaches, heartburn and constipation.9. Vomiting.10. A missed menstrual period"