How is he NOW with regard to pulling his weight at home?
Paternity leave didn't exist in uk when I had dd but ex took 2 weeks annual leave which we'd planned he'd have available and his boss was ok with him taking when baby born as of course they can be unpredictable - as it happened she was born only a day after due date.
Having a baby is a MASSIVE change not only practically but also in terms of the effect on your relationship. We split when dd was 2 and while it was because he cheated I do think my ex wasn't ready to be a father (that he stupidly got the ow pregnant is his own dumb fault!).
I ended up having an emcs, dd was sick and in scbu and we didn't leave the hospital for over a week. It was a VERY worrying time.
Once home there was a lot I couldn't do/needed help with and dd thought day was night! That's tough too.
Frankly he would've been too bloody knackered to work the first 2 weeks after dd was born, he was still pretty shattered when he did go back to work - and it was a fairly easy going job!
In addition when he got home from work there were still things he needed to help me with as I recovered, established feeding, dealt with dds colic...
Is he at all realistic about the demands of a newborn? Sounds like he's in denial, naive or at worst a selfish pratt who just expects you to manage even if the birth is in any way complicated!
I strongly recommend you find out NOW which and address it accordingly.
Personally I think it should be full pay and compulsory.