I did cycle *once* in that snow at the beginning of this year, & wouldn't do it again (pregnant or otherwise) -- I knew it was a bit silly but I was just determined to prove that it was possible (and it was! I didn't actually fall off though I did have one or two wobbly moments...).

Fortunately I live within walking distance of work (it's about a 45-minute walk in the snow, but that's do-able) and there are fairly sensible buses, albeit with a 10-minute walk at each end (so if it's really too icy to walk at any point then I may have to work from home -- fortunately they're OK with that).

And many thanks for the handlebars tip! I meant to ask about suggestions for bike-adjustment but it got lost somewhere in the long rambly post...