Is your H owning this? Is he looking into why this was an option for him? Is he reading books, going to IC and speaking to you on a regular basis about the A? Are you asking questions - peeling the onion so to speak.
There is no one answer for the question you ask. If your WS is saying and DOING you may decide to arrive at R much quicker then say something whose WS has their head up their ass.
While I am happy for your pregnancy, this is all very stressful on you - dealing with the A while pregnant. I can't imagine. But you are blessed with a child.
You do not have to do anything now but take care of you and your baby.
Keep talking to your H and keep posting here.
I guess what all of this means is that just because you make a decision to R or to D or to S, you can always re-think that decision if needed. FWH knows that if our marriage starts going down that infidelity slope again, I am outta here. So maybe it would help you, for a while at least, to just decide that for today, or tomorrow, or for a week at a time, you'll focus on not divorcing? (((hugs)))
D-Day, June 10, 2012