In fact, researchers from the Boston area found that almost half (43% or 86) of 201 pregnant women with a history of major depression prior to pregnancy suffered from major depression during pregnancy.  

They also found that women who discontinue antidepressive treatment while they are pregnant should be especially wary of relapse.  

Of 82 women who continued taking antidepressives during pregnancy, 21 (26%) relapsed versus 44 (68%) of the 65 women who stopped taking their medication. In addition, those who suspended use relapsed five times more frequently during the course of their pregnancies than the women who maintained uninterrupted use (95% CI; 2.8–9.1; 

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In fact, researchers from the Boston area found that almost half (43% or 86) of 201 pregnant women with a history of major depression prior to pregnancy suffered from major depression during pregnancy.