@Waffletots
You are incredible, don't ever forget it. Your strength is formidable and please look after yourself as much as possible during this time.
Whatever you ultimately decide, as has been mentioned here previously; please take out all the joint account funds. And place it in a new account under your name. Get some legal advice asap. Pay those bills manually with those funds via bank transfer, standing order with references etc, keep a note of when they are due and ensure they're paid on time. Yes it means being a bit more vigilant. But trust me, that's preferable to the alternative.
He gets an injunction to freeze that account or he drains it himself and decides not to pay the bills as he's got to secure a new home now.
You absolutely need to be in the driving seat on this. If you can't face it, get your family to assist with it asap so that come time for the birth you aren't further stressed.
Keep records of whatever you are doing in this regard and do not touch those funds other than for the purposes they were originally deposited in that account for. You are entirely entitled to do this.
The only issue any court would have with you draining those accounts is if you took the funds out and denied having them and sought to hide them and put both of you in further debt. If you can easily demonstrate to a solicitor or a court that you felt the need to secure those funds for their ongoing intended purpose ie. mortgage, bills, etc and they are still paying those off, then there's no issue.
So please don't worry about doing it, because you're appointed solicitor will seek to secure an interim arrangement anyway. So whatever you do, know it's a temporary step to cover your security, especially seeing as you are so close to having your baby.
It's possible that the shit, your DH could put a freezing injunction on that account. But that depends if he is very financially minded or not at the moment. But as he now knows the OW has dropped him in it, and you have family around, he knows that it's unlikely he's going to successfully change your mind any time soon, if ever. And make no mistake, one thing these types of men generally hate more than anything in these scenarios is losing control of the situation. His silence could mean he's now planning to protect himself financially. He does after all now need to secure a place to live and that will cost a lot at short notice.
You need to put yourself first. Wishing you OP and your loved ones all the best during this difficult time. You will get through this. xx