Some tests are routine for every pregnant woman, some are routine in some areas of the country, and some are performed only when necessary.
Depression during pregnancy, also known as perinatal depression, is common and affects up to 1 in 7 women, or 15 percent.
Experts say that spotting should never be considered normal though, and you should always call your doctor if you experience any.
With this test you also can find out your baby's sex.