I hope your DH has stopped not speaking to you and being angry with you.
From what you said. It wasn't you leaving that caused inebriated FIL to cry.. it was the fact that after your dd fell over near him and hit her face on table.. the rest of the Bickerers all turned around and had a go at him.
There is something wrong with him for crying like that.
You were'nt even there as far as I can tell from your posts, but at the park.
Why is he blaming it on you.
There is something wrong with people who always have to seek out people to blame for every little thing. They, including your DH sound like a bunch of drama llamas.
I think as a 30 week preg mother of active toddler whose spent the entire time keeping her out of the way of a dog and having to stay sober whilst everyone else is drinking ( which always raises the temperature amoungst argumentative people) you have had a tough time. You did tell MIL you were taking DD out (sensible) and she didn;'t seem to have communicated that to your DH, all the while the rest of them were asking where you were.
Has your DH accepted that you did tell someone where you were going?
Has he accepted that it was a good idea to remove your DD from what was becoming an increasingly heated situation?
It maybe that there was an element where you were to "blame".. but for what? For the drama they were all making over nothing, and after several drinks? It seems odd that he decided everything was your fault.
Surely everyone could have behaved better in this Much Ado About Nothing scenario.. and it seems unfair for him to lay it all on you and no one else.
If he is still sulking and blaming... he needs to grow up, put his issues to one side and focus on the fact that you are about to give birth, and could do without the stress raising your blood pressure which is never good for heavily pregnant women. Are you due a check up soon?
And he needs to recognise that this is a time in your life when you need support and kindness, not chewing over pointless stupid arguments that are now in the past. He needs to Cut you some slack and start looking after you whilst you prepare to give birth to his child and also step up parenting of his DD to give you a chance to relax after all this mayhem.
Do you need some TLC from your own family? Would that help ATM?
I hope you now get a chance to relax, cuddle your DD and put this behind you for the important things like giving birth shortly. Wishing you a smooth delivery.