Hi Alton,
there is no medical literature out there regarding this topic.
An articel of Wendy Rogers (http://www.skysisters.com.au/userfiles/files/Pregnancy.pdf) did a good summary with case reports.
On the other hand I have put out an online questionaire to get a sufficient number for a more objective approach. (http://www.surveymonkey.com/s/M8RDHG6)
So please if you have been pregnant and did jump go and answer those 10 questions.
thanks,
Florian Ebner MD