First of all - awe..... on the boy and girl - what a blessing! They sound adorable already. What a proud parent you must be when you are away from all of this D stuff.
Second, deal with your feelings here, while walking, etc. Being sad is ok IMO. Did you consult with a lawyer about the rules? I thought one can file, serve papers whenever, and then once they are signed I thought it was 90 days from the signatures. In our state there is a 90 day waiting period after the papers are signed in which the D can be revoked or cancelled or whatever they do to stop it. I don't know the time period for serving and the time line after serving for signature. Then there can be the waiting period.
All in all, being sad is normal! Don't worry about it - don't hide it. Just don't mope, whine and complain. Women really hate that in men. I feel awful for you. Share your sadness and feel awful with you. Will check in later.