Some of the earliest signs of pregnancy include spotting, cramping, breast changes, nausea and a missed period, according to WebMD. Not every woman experiences the same symptoms.
WebMD further states that the symptom of fatigue can often be felt as early as one week into the pregnancy. Since the earliest signs of pregnancy can also mimic the symptoms a woman has prior to menstruation, they are often missed or dismissed, according to WebMD. Having a pregnancy test is the only for a woman to find out if she is in the early stages of pregnancy, or if the symptoms are related to menstruation.