Oh, congratulations!! What wonderful news. So happy for you.
And of course you are looking at dresses! That's exactly what you should be doing.
I adore the one you linked to. Very elegant, celebratory, and feminine, and it would look beautiful on you, I am sure.
I second Vix's suggestion to consider David Meister dresses. I got that one navy dress for my "stepmother of the bride" from Nordstrom on super sale, and WOW, the quality just amazed me. It is such a beautifully made item. And he makes some gorgeous dresses.
But the other options linked are also great. This is exciting!