Oh I was missing you DV! Congratulations and welcome back. You look beautiful. Your outfit is lovely and such classic DV style.
My maternity wardrobe (kiddos are 3 and 6) worked really well for me. I went with a very limited wardrobe organized with a capsule approach, even though I didn't yet know what that was when I did it. I kept my color palette limited so the pieces worked with each other. And oddly, even though I was used to a very big wardrobe, I was really happy with my maternity wardrobe. So little to think about when I was getting dressed. It helped too that I knew it was only going to be for a short time. I had one bottom for each day of the work week and one top, plus one pair of jeans and two maternity sweaters. I mixed and matched them, but everyone was guaranteed to see me in my olive trousers at least once a week. It was fine.
If you decide to wear your current knitwear while you are pregnant, keep in mind that it will very likely permanently stretch it (not guaranteed, but more likely than not) and you won't be able to or want to wear it after a couple months postpartum.
I absolutely loved the Gap for good quality maternity office-appropriate work wear at great prices. I bought from Old Navy for fun, cheap weekend stuff. Now Loft, AT and JCrew all have maternity too, so they are available as options that I didn't have. Lucky you!
So, unasked for advice, right? But maybe it will be helpful, so I couldn't help but volunteer!
Welcome back, dear. You look fab!