Do you plan on like never going to the doctor? Just.. delivering the baby yourself? I mean.. if you don't get clean and then go into labor and go to the ER, it isn't like they just deliver the baby, give it to you, and say "Thanks, see ya ! " .. They do scores of diagnostic testing, making sure they baby is healthy. And one of the first things they are gonna do is give you blood tests, with a tox screen.. They are gonna know if you/the baby is an addict.
I don't care if you say 'don't post'. This is totally unfair to the baby.
Go to the doctor, and get on methadone. It's pretty simple. Get a proper pregnancy test, then if you are truly pregnant please take the proper steps to get yourself/the baby clean. OR, just get an abortion if you really don't want the responsibility of raising a child. But whatever you do, please think of the kid and how much it's/your life will suck if you don't do things the right/responsible way.
I'm not trying to personally attack you, but it seems like you know the right thing to do, but just don't want to do it..