opponent(Noun) An individual or group who is a rival of another. opponent(Noun) One who attempts to stop the progression of. opponent(Noun) One who objects to. opponent(Noun) In team sports, a player of an opposite team.
First Trimester (0 to 13 Weeks) The first trimester is the most crucial to your baby's development. During this period, your baby's body structure and organ systems develop. Most miscarriages and birth defects occur during this period. Your body also undergoes major changes during the first trimester. These changes often cause a variety of symptoms, including nausea, fatigue, breast tenderness and frequent urination. Although these are common pregnancy symptoms, every woman has a different experience.
Pregnancy: The First Month. Physical changes in the first month of pregnancy. The first month of pregnancy begins in the third week after your last menstrual period. During week three, the egg cell is fertilized by a sperm cell in the fallopian tube. The fertilized egg cell travels through the fallopian tube to implant in the uterus.