I have 2 herniated discs from a car accident over 2 years ago. I am 16 weeks pregnant and have been taking percocet 512, 2 times a day because I literally can not move due to the pain when I do not take the medicine. What are the risk factors of taking this medicine during pregnancy? Have there been any legitimate studies done on this subject, if so, what are the results? Also is there any medicine that has been proven to work for such chronic pain in women who are pregnant? Thank you.