Think you're pregnant? Check against these five early tell-tale indicators of pregnancy, which may begin as early as the first few weeks after conception -- before you even miss your first period (the most obvious sign of pregnancy). While not every pregnant woman will experience these signs, they're nevertheless very common pregnancy symptoms, and you may want to look at these classic signs before you head out to get the pregnancy test kit.

Early pregnancy sign #1:

Spotting

For some women, a small amount of spotting or vaginal bleeding is one of the first symptoms of pregnancy. Known as implantation bleeding, it occurs when the fertilized egg attaches to the uterus lining -- about 10 to 14 days after fertilization. This type of bleeding is typically shorter and lighter than a normal period. Some women may also experience cramping.

Early pregnancy sign #2:

Fatigue

Feeling fatigued can be another indicator of pregnancy, which can start as early as the first week after conception. Many pregnant women report feelings of overwhelming tiredness, especially during the first trimester of pregnancy.

This is the result of soaring levels of the sex hormone progesterone, which raises the body's temperature slightly and make you feel sapped of energy. At the same time, lower blood sugar levels, increased blood production and lower blood pressure can contribute to the feeling of fatigue. In most cases, energy levels should return to normal by around the fourth month of pregnancy when the placenta is functioning properly.

Early pregnancy sign #3:

Tender breasts and changes in breasts

During pregnancy, the breasts become fuller, tender or swollen -- similar to what is commonly experienced during the few days prior to menstruation. Swollen or tender breasts, sometimes with a tingling sensation, may begin as early as 1 to 2 weeks after conception.

Changes in the breasts may be noticeable, such as the darkening of areolas, more sensitive and erect nipples, the enlargement of the Montgomery's Tubercles -- the little bumps on your areolas, and more prominent veins across both breasts.