] I know that his first concern was Georgiana's feelings if Wickham's name were mentioned,

Georgiana seems to think Darcy thought about her situation with Wickham, but the text says that he "scarcely recollected her (Georgianas) interest in the affair,"
I think Darcy is concerned how Elizabeth will act. He still hasnīt seen that much of her since the proposal, and though he knows his own feelings and can see her behavoir towards him isnīt as angry as it was, he doesnīt know if she still favours Wickham. I think part of the ease he felt after her answer is because she didnīt show any partiality for the loss of the regiment.