Pregnancy tips Pregnancy and Post-partum Depression

I've written before about post-partum depression, however, according to the article below, depression can be quite common during pregnancy as well. Here is an article from thyroid.about.com about depression in pregnancy and a possible thyroid connection:

Depression During Pregnancy: Common and Often Undetected (thyroid.about.com)

From the article:

Source: AHRQ Research Release, May 2005) According to a new report by the Department of Health and Human Services' Agency for Healthcare Research and Quality (AHRQ), depression is as common in women during pregnancy as it is after giving birth. Health care providers and patients may fail to recognize depression during pregnancy because signs of depression like tiredness, trouble sleeping, emotional changes, and weight gain may also occur simply as a result of being pregnant.
According to the report, roughly 1 in 20 American women who are pregnant or have given birth in the previous 12 months are suffering from major depression. When episodes of major and minor depression are combined, as many as 13 percent of women experience depression. The report defines perinatal depression as occurring during pregnancy and up to 12 months after childbirth