Spotting and cramping, breast changes, fatigue, morning sickness or nausea and a missed period are all classic early signs of pregnancy, according to WebMD. Other signs include frequent urination, constipation, mood swings, headaches and back pain. Less commonly, fainting and dizziness may occur.
Implantation bleeding, which occurs within 6 to 12 days following fertilization of the egg, can cause spotting and cramping due to the egg attaching itself to the uterine wall. Cramping is similar to menstrual cramps, and when accompanied by bleeding, implantation bleeding is often mistaken for the start of the menstrual cycle, states WebMD. Bleeding is lighter and lasts far less time than a traditional period, however. Some women may also see a milky white discharge from the vagina that is caused by thickening of the vaginal walls and the growth of cells lining the vagina.
The breasts may become tender and feel fuller or heavier during early pregnancy. This is due to the surge of hormones that occurs following conception. The areolas may also become darker.
The surge of progesterone during early pregnancy can cause pregnant women to feel fatigued. This can also be caused by a boost in the production of blood or low blood sugar levels.
Morning sickness is one of the most easily recognized signs of early pregnancy, but it does not necessary occur during the morning and not all women experience it, and those who do usually feel nauseous when they smell certain foods. This symptom of early pregnancy usually subsides by week 14, although some women experience it for their entire pregnancies.