Book the day off, if that's what's needed, by you.
I was diagnosed with lung cancer on Friday 13/10/2009. I had a weekend to come to.terms with this, after telling my family, friends, boss, colleagues, team members.
Over the weekend I realised I was in no fit state, mentally, to go back to work. Physically I was ok, a bit uncomfortable, but that was it. But mentally? I was a basket case. !luckily for me, my gp completely understood and happily offered me a sick note until december, by which time all other tests to determine next steps would be done.
Neither you, nor your husband, can tell what your mental state might be. If it's good news (I do hope it is) or bad, your mental state is unlikely to be unaffected. For the sake of one days leave? Why not?