I understand this is really tough, especially when she's pregnant and emotions are already running high. From what I've seen with friends, sometimes pregnant mums need a bit of space after conflict, but a month is quite long and the silent treatment can eat away at both of you. Have you tried writing her a note or message instead of talking face-to-face, just to say you're sorry and that you want to work things out, no pressure? Sometimes that feels less confrontational and gives her time to process. If things don't improve soon, it might be worth considering couples counselling together, just to have someone neutral help you both communicate better before the baby comes, because you'll need to be a team then.