Stress might be linked to higher rates of miscarriage (researchers are still debating and doing research).
"Stress has long been suspected as a possible cause of miscarriage, with several studies indicating an increased risk among women reporting high levels of emotional or physical turmoil in their early months of pregnancy or just before conception...."
http://www.webmd.com/infertility-and-reproduction/news/20030605/how-stress-causes-miscarriage
"During early pregnancy, miscarriage may be more likely among women with high levels of the stress hormone cortisol.
That's according to a study published online in the Proceedings of the National Academy of Sciences.
The study shows that miscarriages during the first three weeks of pregnancy were nearly three times as common among women with high cortisol levels, compared with women with normal cortisol levels...."
http://www.webmd.com/baby/news/20060221/stress-may-up-early-miscarriage-risk
"Stress has long been believed to be a contributing factor in miscarriage, although proof of the relationship has never been firmly established. However, in 2006, a significant study showed that miscarriages during the first three weeks of pregnancy were nearly three times as common among women with high stress hormone levels as among women with normal levels...."
http://www.medicinenet.com/script/main/art.asp?articlekey=78713 
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