text: i just found out i'm pregnant and take percocet for severe back pain....? anyone have any experience with this?  do percocets cause birth defects?  i only take 2/3 a day - depending on need for pain.  thanks. remeber that whatever you put into your body, you also put into your baby.  percocet is a combination drug - acetaminophen and oxycodone.  they are both in the pregnancy risk category b.  i'll give the complete list for future use:    category a:  no evidence of risk  to the fetus category b:  low risk in first trimester, no evidence of risk in later trimesters. category c:  evidence of possible risk, give if benefits outweigh the risks. category d:  positive evidence of risk but the benefits should outweigh the risk. category x:  contraindicated with pregnancy.  the risks outweigh the benefits.  always make sure your doctor, and in your case, your ob/gyn, are aware of all medications, vitamins and herbal supplements that you are using.  you have most likely done no harm to the embryo but speak to your ob right away about the advisability of continuing this medication.