Wow- this thread has generated a lot of emotion. I would just like to stick to the facts that stand out for me.
1. Your WW was obviously still foggy when she admitted her A -as she was hoping it would end your M and she was already trying to get pregnant by the OM too.
The fact she now sees the OM is not mature enough to be a full time dad to their and your children shows she is starting to realise the A was based in fantasy land.
2. We see here so often that the WS admits the A and then they are expected to immediately have no feelings for their AP? Your WW is still in the place where she is seeing the reality of their A more now BUT she still has feelings for the AP... these are probably being compounded by the fact she is (may be) pregnant by him.
This is something that may or may not cloud your future... will she look upon him as the father of their child only or will the emotional romance still linger on and will she also view him as a potential love interest? Only time will tell on this one actually.
3. She COULD have lied to you about knowing it might be his and/or she could have lied to you throughout by saying she thought it was yours- obviously, once the child was born then the truth would out but she at least admitted the truth to you from the off so I commend her for this.
4. For all intents and purposes THIS was not what she envisaged happening- she said she thought the M was over and that you would be S and heading for D right now so the fact you ans she are contemplating a life together is because of one of 2 things:
She realised the OM would not be able to support yours and their kid so she stayed with you in the hopes you would allow the child to be born
OR
She sees something in you that she is still drawn to and THAT is something that can be worked on.
IF you both go into MC and IC with your eyes open and you both put the hard work in there is no reason why the spark cannot be reignited and your M can get back on track.
5. The OM wants to see his child and be recognised as the baby's father- He has every right to do so.
Can you act as the go between more than your WW?
In the years to come you could make this work BUT how would you feel if, say, (I am playing devil's advocate...please bear with me) OM buys OC a HUGE Christmas present that you say the child can't play wit until after dinner and the OC says, "But MY Daddy says I CAN!"
But- he has a right to see his child if the outcome is that the child is his.
(As an aside- I KNOW he shouldn't have been having sex with her in the first place but that is by the by now- he did and she is pregnant... and he is not scuttling off and leaving STF to pick up the financial and moral responsibility!)
Can you agree ground rules that will stay in place for ever?
6. Hopefully, your children will just see OC as their sibling- end of! They will have to deal with the aftermath years ahead of this but, if you deal with this right from the off, there is no reason why they cannot accept their 'different' family.
(I am not advocating adultery as a way of bringing children into the world but, hell, if you guys stay together you HAVE to make this work for all of the family)
7. You say adoption and abortion are not an option and I really think other posters need to back off on this point. This is your life and you have both agreed this point so we need to stop throwing these option into the pot as though they are something you need to seriously consider.
I do think you need to look at your situation from a point of complete clarity but I admire what you are trying to do. I really do admire you- you sound like a good guy and I can see why your WW is confused about what to do as your qualities mark you out as a strong character not a wimp!
My advice to you?
Get your ducks lined up just in case.
Watch your wife to see if she is working on remorse and if she is gradually understanding that she has right, royally, f****ed up- and if she is putting in the work to try to make it up to you? Then work on the M.
Has anyone read the book From Rape to Restoration?
If you want a stranger than fiction read then go buy the book- A woman gets raped> keeps the baby> her H accepts that INNOCENT child as his own!
I know the story is different but guess what?
This is a unique story here too... and STF wants to keep his M together- who are we to judge?
I am not saying anybody here is right or wrong- what I am trying to do is support a guy who is in the middle of so much f***ed up-ed-ness his head must surely fall off!!
What I want to say is you have admirable qualities- as long as you are not being hoodwinked or letting your WW dictate the pace of your M- then I hope you get through this and I hope yours is a story with a happy ending.
Your wife and the OM did you wrong and they should be punished for that but.... the fact you are willing to forgive and try to make this awful situation work in some way? I take my hat off to you.