Hi Dunnyjo.
my mum passed away when i was 14wks pg with ds. she was told her cancer was terminal 4wks after i told her i was pg and died within a month of that. I know what you'll going through as much as anyone can (cos we're all differant)
i have no answers, but some things that worked for me
speak to your new baby about how brill your mum was, even if it means you end up in tears most of the time.
don't ever feel you should be "better" by any given time.
talk to your dad,sister,husband,anyone who'll listen.
think about the things your mum has taught you, so even when she's not there with you, you know the reason you're doing the mummy thing that way is cos she'd be telling you to do it that way if she was. (does that make any sense?)
be brave and be a crumbling mess in what ever measures you feel like.
when i became a new mum, i met four other people in the same baby cafe who'd also lost one of their parents in the couple of years prior to our babies arriving. since then we've all felt c**p, ok, not so ok, angry, cheated, but all at differant times.
Always remember there is always someone else out there, either at a baby cafe(or equivalent) or on MN who is there/was there/will be there again.
love to you. it does get better,then it gets a bit poo again, then it gets better again.