Your OB will as your previous pregnancy history, I think you should tell your OB the truth. As for if the previous 药流 will affect your future pregancy, it's hard to say. Different people has different cases. And that's another reason why you should tell your OB about that. I'm not sure if your doctor will keep this as secret since having baby is both mom and dad's thing, but he/she probably will, because doctor should keep his/het patient's sectret. Maybe when you visit your OB for the first time, you can go by yourself and not with your LG, and let your OB know that you want to keep the secret...