As long as the baby is still growing well it is okay to lose weight. Especially if you had a little extra to begin with.
I have lost 27lb and just started putting some back on, doc is not concerned.
Hey, yes it does seem a lot to lose. Wish it was me. That said, so long as your baby's growth is line with what it should be for how far a long you are then I would say your ok . Are you eating well?