Glaxo maintains a Bupropion Pregnancy Registry. Interested health care providers can obtain reports by contacting the Registry. See:
http://pregnancyregistry.gsk.com/bupropion.html
The risk of Lexapro with respect to birth complications is similar to that seen with other SSRIs. There is nothing more worrisome than e.g. giving birth while exposed to Zoloft, in any case.
Multi-drug exposure, SSRI plus something, has not been shown to increase the risks during pregnancy.
I hope this is sufficient, but I could give references if you need them.
Lar