Appropriately dosed psychiatric meds are fine throughout pregnancy,,there are certainly some that we don't give during pregnancy, and usually women who are on those and then find out early that they are pregnant are fine, we switch them over and there is no sequelae,,,however, OD'ing on meds (who knows what she took) to make you unconscious doesn't sound like regular anti-depression meds and if it was enough to make her unconscious with low blood pressure then yes the lack of oxygen perfusion to the placenta and fetus can cause a miscarriage...my take is that she purposely tried to kill herself and the baby (ive always thought she knew she was pregnant) once JFG told her Gideon was engaged and her ply wouldnt work... 
  
OK ob gyn physiology lecture of the day...gotta go see patients anyway, bye