this is my own personal opinion, but i also took vicodin during my pregnancy and never told anyone either but towards the end of my pregnancy the doctor found out because of a test that they ran and it showed up in my system and because i kept it from them it looked really bad and i was getting the prescription from another doctor that i didn't tell i was pregnant. might i add though i had an addiction to pain medication so i was purposely hiding it and at the end i got the baby taken away from me. I've been clean for almost 14 months now and got my children back thankfully. So i would tell you that being open to your doctor would be the best thing and they will take in consideration your disease and believe me they will work with you and work it out. the sooner the better though