OP here, sorry to have posted and run. Thank you for your concern, I'm ok.
My second labour went a bit awry, EMCS under epi turned into a major 3+ hours surgery because of adhesions causing a lot of problems. DH was in theatre with me until I was put under GA, at which point he was ushered into a waiting room, and left on his own until it was all over. My consultant went to update him, and explain what had happened, which is how come he was told first, while I was still unconscious in recovery. DH relayed it to me as he saw me first. My consultant came back to see me and told me herself as well. I have no issue with him being told first, my consultant knew I was happy for anything to be discussed with DH. But it does mean that he knows, really knows, just how much I DON'T want to risk getting pregnant!
We had a big talk about it all yesterday morning. He did not explicity say "I am wearing a condom", I did not explicity ask, but we've discussed this before (to avoid having to discuss it at the time) and agreed there would be no intercourse without condoms. As per usual I made a vague inquiry, and got an affirmative response. We clearly miscommunicated, and that won't be happening again. He pulled out before he came, so he thought that would have removed any risk, which was why he didn't think it was as bigger deal as I did. I told him it doesn't remove the risk at all. DD2 was a long time in the making, so I think that was a factor in him not panicking like I did.
Once we were on the same page, he was very, very apologetic. He's going to speak to his GP about getting the snip, his suggestion, not mine. He was kicking himself that he put my health at risk. He spent the whole day just looking after me and our DDs. I believe him when he says it won't ever happen again. He is not usually a selfish man. We've had our ups and downs but we normally have a very stable, respectful, caring relationship.