Bet I can guess why his ex dumped him - regardless of what he's told you of why they split!
He's a lazy selfish knob!!
HIS dd is HIS responsibility. And he should be supporting you and taking on more of the housework than you just now. No pregnancy isn't an illness but some women have a tougher time with it than others.
He will expect you immediately you're home from giving birth to do EVERYTHING and will call you lazy if you don't.
Time to put him straight in no uncertain terms. He needs to be supportive, pick up your slack or get out - you'd have MUCH less to do then I guarantee it cos you won't be cleaning up after his arse or doing HIS share of parenting HIS daughter.
Did you only move in together due to the pregnancy? After getting pregnant?
You are his partner NOT his servant!
The cost of childcare is BOTH of yours responsibility. Is your income after HALF childcare still too low? NO NO NO - he pays half childcare too! Wtf!!
Plus I think it's highly likely you're going to end up a Lp, either he'll flounce cos you're not doing what he thinks you should or you'll react due to exhaustion and kick the tosser out (hopefully) so going back to work in a relatively short time frame is more realistic to be honest.
How old was his dd when that relationship split?
So he thinks cos he earns/contributes more (but he hasn't taken into account adjusting for his being responsible for more financially as he has a child) that makes you his servant ? Er NO!
DO NOT have a joint account with this dick - he's all "what's mine is mine and what's yours is mine too"
In all honesty I think you're better getting rid altogether! Do you rent or is there a mortgage? Where do you stand if you split re home? Could you get somewhere to live?
At the very worst example of fairness it should be you both pay half each mortgage/rent, bills, CHILDCARE and whatever you each have left is yours to do with as you please, though actually DECENT men would account for his earning more, that you're in a bigger house because of HIS daughter you're not responsible for a full half of rent/mortgage.
"Lol Soubriquet not that this will help my case of staying with him but he's already said he'd work abroad to not pay maintenance"
GET RID NOW!!
Highly unlikely he'd actually do this, even if he did he's so tight anyway you're better off on your own.
I do despair of women getting into these situations! For any other young women in new relationships FOR THE LOVE OF GOD don't rush into things, preferably marry before pregnancy, at the VERY LEAST live with them a couple years before doing so - how they are when they're sick, when you're sick, about housework, money etc - you need to know BEFORE you get pregnant.
I started typing:
This is straying into financial abuse now.
Actually it IS already financial abuse, emotional and verbal abuse, gaslighting.
He is a selfish bastard! He will not change, you will end up doing everything for all 4 of you AND paying for the privilege - much easier to get out now!