I agree, with Sara. If your being prescribed the pills, it should be no problem for you to just be honest with your Doctor, he can help you. You shouldn't try to stop alone, you should do it under OB supervision so that he can monitor you and baby and make sure your both fine. I stopped taking lortabs when I was around 12 weeks pregnant, and I was scared but I did it for me and mostly for the baby. There are others on this forum who can be more helpful than me, I'm sure they will be on sooner or later. I wish you all the best, you and baby. You can message me if you want to talk.
You really need to come clean with your OB. That way they will be able to monitor you and the baby while you get clean. Most babies are tested at birth and if your doctor knows about your drug use there will be no surprises. As for buying meth that isnt the thing to do. That comes with alot of problems.
How far along are you? And How much do you take daily?