My husband had a heart attack late one Sunday night. He was in the hospital until he died, about 36 hours after the heart attack. For the longest time - probably 2 months - my first thoughts when I woke up were of the events over that time. Every day, I saw him in the hospital bed. I think it was my minds way of trying to process that he is gone. I saw it with my own eyes sort of thing. I stayed in bed those days until I just could not any longer without being late for work (not good as I teach at University). I don't have those same thoughts every morning any more (just past 3 months out now), but I still have lots of moments where I have to remind myself it's true.
Work, for me, was helpful. It was the place I felt most "normal" because my husband was never there with me, so I didn't notice his absence nearly as much. I had an opportunity to tell all my "customers" (students) at once in my first class back, but it was very difficult, and I choked up a few times. Boy, how to freak out fifty 22 year olds at once! But after that I found everyone to either be very caring and understanding or to just avoid it,which was ok too. I completely understand not wanting to cry, but I don't know that anyone cares about that as much as we do. I think people will be understanding. If they care enough to ask about your baby, I would assume they will care enough to hear about your husband and will understand any tears. Well, at least that is my sincere hope for you. My only suggestion is to have a bit of a script ready. That way you can detach a bit and just recite what you prepared. That's what I did for all my classes.
Take care.