I did this with DS. My mom remembers her mom using breastmilk to treat her brothers' and sisters' cuts and eye infections. I tried it, but it didn't work for us --- but I think it may be because there were allergens in my milk because of what I was eating.
It was the first thing I tried, and I would do it again ... things that have worked:
-eliminating wheat (i eliminated other things, which alleviated other symptoms, but when I stopped eating wheat, the eczema cleared up in about 2-3 days)
-not continuing with vaxing (DS has 2mo, 6mo, 10mo --- broke out in eczema that became infected with impetigo every time and i finally said no more)
-epsom salt baths with a splash of apple cider vinegar from time to time
-very, very, very rarely use soap (like once every couple of months or so) -- and the only -ingredients are olive oil, water, and salt
-flax seed oil -- i take in capsule, we also open capsule and rub on DS when eczema is bad. he can now eat some with cool foods as well (heat changes structure too much)
-some people find witch hazel helpful for alleviating the itch, but i know some may be allergic to it
that's all i can think of right now. good luck to you, mama, with the eczema and your upcoming birth of your baby!