During week 8 of pregnancy, you're continuing to experience changes. This week, you'll probably still feel some of the more negative effects of pregnancy like extreme fatigue, abdominal cramping, and pain in your lower back or buttocks. You may also notice a bit of weight gain (though nothing significant in the first trimester), or perhaps weight loss due to morning sickness. Either way, your physical appearance probably won't change, but you'll definitely notice subtle changes in how you feel. This is because your uterus has already grown to about the size of a grapefruit! Your breasts are also growing and probably becoming very tender or sore.