He may have said this under the stress and used humor to make a dark sensor of humor joke to cope with but since he said it his friends and not to you, means he was likely saying it as a coping mechanism when he was with his friends. I don’t think he meant it as an insult to you, but when someone is with their friends, they’ll say stuff they wouldn’t dare, nor want to say, directly to your face as it’s a safe space. The humor was meant to make light of the change in life, but it was not meant for you to hear it. Kinda like some women (or men) get together and swap stories and criticisms of boyfriends/girlfriends/spouses/exes when together trashing their shortcomings and other trashtalking, and it’s not meant to make it back to the subject of the statement. Tbh, I’d be interested in how you found out about what he said, as it seems someone violated a safespace to stir drama, and it would be akin to your friends telling him trashtalking you may have done. Theres some analytical subjectivity needed here, and while you may be offended, people can’t be perky and well adjusted 100% of the time, or therapists would be out of a job. Instead, if how he treats you changes, or how he talks to you does, males can, and also do go through depression, stress, anxiety and all sorts of life changes when a baby comes, and he may need therapy and support if behavior changes. This is why companies are now extending maternity leave to fathers as well. Now then, please understand that dark humor and dirty jokes can be a coping mechanism. Not a direct attack, and who he said it to does indeed matter in why it was said. If it’s not to your face, I wouldn’t worry or you’d be shocked at what you likely haven’t heard even worse.

I'd wait for him to have the hangover done with and then demand a flat out ******* explanation. 3 weeks pp? You're not (or should not) even be thinking about sex yet. He can either grovel for forgiveness or pay child support if that's what he thinks. His choice. Because, personally, I'd never be able to get even slightly hot for a guy who kicked me like that 3 weeks after the scariest and most changing experience of my life to date.