I agree 100%!!!!!
If you sincerely want to do things the best way (which I'm sure you do)...kick this habit FIRST before even trying to get pregnant. Take your time and make sure you are in a healthy place, free of the addiction demons before taking on something so big and important.
And yes....unless a specific tox screen is ordered, the Norco will not be detected in your blood. That is not a standard test, and they would have to have your consent first.
Best of luck to you!
The lab work that they will do will only check for your progesterone/estrogen level. They cannot tell if you have been doing opiates w/o your consent. This is not standard practice in an ob/gyn practice anyway. Just try and taper quickly as you dont want this addiction throughout your pregnancy. (bad outcome for u and baby). As far as the w/d they will detect that your bp is elevated and you may have other signs of w/d. You can wait until the bloodwork is done and then detox. It is up to you but DONT get pregnant on these drugs. Your baby will suffer for it. Good luck