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Your Changing Body Week-by-Week

From the time of conception until the time you give birth, your body is going to go through some major changes. Find out what to expect with our week-by-week look at your changing body.
woman contemplating Week 3

You may experience some light vaginal bleeding when your egg implants, which many women mistake for a period. In fact, spotting that's lighter than your usual menstrual flow is one of the early signs of pregnancy. Do give your doctor a call, however, if the bleeding is fairly heavy or you experience abdominal pain, like a sharp stabbing in your pelvis or even mild cramping on just one side. Although uncommon, these symptoms could indicate an ectopic, or tubal, pregnancy. This happens when the fertilized egg attaches itself somewhere other than the uterine wall -- usually in a fallopian tube. The most common causes of an ectopic pregnancy are inflammation of the fallopian tubes and an infection in the uterus, fallopian tubes, or ovaries.