Strange - Just checking in with you again this evening. I'm continuing to follow your thread in JFO. I can't post there, because I am a "madhatter". In other words, I cheated in my relationship as well. The moderators of this site said they are okay with me posting within this OC thread, though.
I'd have to agree with everything Want2help told you. Things do get better with time and healing. That being said, I think it's important for you to take an active role in your healing, legally, by getting yourself in the best possible position you can be in, as well as mentally, by getting whatever help you need, be it, SI, or IC, or MC. Just know that we're here for you, and we have your back.
Me: Huh? What kind of family is this?
I read the dialogue that you made up of OM with his mom. Sounds batshit crazy doesn't it? But it really wouldn't be that far fetched if that turned out to be the case. I personally know of a situation very similar to that. It is one crazy and fucked up world out there, I am telling you.
If you don't mind me touching on the biracial thing - this is something that I have had concern about as well. My wife and the OM are both biracial, and both from totally different racial and ethnic backgrounds from each other, and from myself. I have worried about my son taking on some features of OM's ethnic background, and having to explain things. Luckily, my son passes off very easily as a mix of her ethnic background and mine - obviously, or else I wouldn't have been fooled for all of these years, I suppose, right? I guess what I'm getting at is that studying the baby's features when this child is born won't be enough. I think the amnio DNA test is a great option if both you and your wife agree to the risks. If not, definitely talk to your attorney about what to do about signing the birth certificate.
It's pretty much assumed that if a guy is married and in the delivery room with his wife, that he will be signing that birth certificate, no questions asked. There weren't any questions asked in my case, aside from having the paperwork handed to me on a clipboard. Sounds simple, but there are lifetime legal consequences and responsibilities involved.
You knowing that there may be good possibility of a paternal discrepancy (yeah, that's what they call it) ahead of time, may work in your advantage, legally. Perhaps you can have the opportunity to withhold from signing the birth certificate, and your wife putting "unknown" as the father. Shortly after, perhaps you could legally adopt this child, and have your name put on the birth certificate without the OM being able to legally contest it. These are all "perhapses" though. Only a lawyer could tell you what your options are in your state.
My buddy Alexa071, whom I met through this site through very similar circumstances gave me some of the best advice. He told me to go to the richest part of downtown, find the best high rise building, and hire the family lawyer that is sitting on the top floor of that building. There is a reason why that attorney is so successful and can afford to lease there. Don't settle.
All of that stuff aside, my main concern right now is for you. How are you holding up? I know you are dealing with a lot, and I don't feel like it has all hit you yet. Feel free to reply here, or hit me up on PM at any time. I'm here for you.
Take care.