Feeling nauseated can begin at week 3 as the HCG hormone starts getting released into the newly pregnant body. At week 3, what people call morning sickness is a full-day sickness. For a woman pregnant with twins, nausea may start getting worse at week 3. 1-2 weeks after conception, the hormonal changes and increased blood flow might make the breasts feel sore, swollen, and tender. They might also appear larger, feel fuller and heavier, and change in appearance. Increased hormones might also make areolas look darker. While the baby in the womb begins to develop, by the time of 3 weeks of pregnancy, chances are of losing weight. The weight loss can be as a result of vomiting, loss of appetite and nausea which could be due to the changes the hormones are experiencing. At this time the implantation will begin. This is a process whereby the fertilized egg picks up its journey, usually about three days, and moves from the fallopian tube into the uterus for proper nourishment. It is in the uterus that it stays for the next 37 weeks until delivery takes place.
Apart from that, it is likely to have light vaginal bleeding as a result of the egg implant. This is not a period. But in the case of a fairly heavy bleeding or a sharp stab around pelvis, then one may need to consult the doctor. This could be a result of the fertilized egg attaching itself in another place apart from the uterine wall. This process is called a tubal or ectopic pregnancy.
A feeling of pressure in lower abdomen or even mild cramping without bleeding is very common, especially in first pregnancies, and is usually a sign that everything is going right, not that something’s wrong. What the feeling is may be the sensation of embryo implantation, increased blood flow, the thickening of the uterine lining or even the growth of your uterus (and it could just be gas pains).
To sum up, below are the body changes occurring during the 3rd week of pregnancy;