They might be pissed off Emma but that says a lot more about them than it does you. If they want to be insensitive, unsupportive idiots, let them. The health of you and your baby has to come first. You can go on maternity leave from the end of Jan and you don't have to see them again until you go back.
Throw up all over the carpet several times, that should convince them. Lol. I'm joking obviously, you shouldn't have to convince anyone.