Milk drying up while pregnant :(
congrats on your pregnancy!
I lost my milk both times before I even got my BFP. I tried 'more milk too' by motherlove or something. It is a tincture that you can pick up at whole foods or other natural food store. It supposedly helps lots of people, but I didn't notice anything. Make sure you are getting plenty of water and rest and try not to be stressed about it. My girls both ended up nursing through pregnancy and tandem nursed for a year (and am still nursing DD2 and DS).
My milk was gone somewhere around 16 to 18 weeks into my latest pregnancy. It was heartbreaking, because my son cried for more milk when there was none. I gave him water at night when he was thirsty after nursing and he eventually rejected nursing altogether, saying "NO, milk, Go away!" When I offered after that point, he refused. Now that I have a newborn, he has asked to nurse twice and both times refused when he sees my breast, saying "No, I don't like milk." I hope that dry nursing and tandem nursing work for you. I wish they had worked for us. Other than a sad couple weeks when my milk was gone, we are all fine emotionally and nutritionally. We snuggle and play a lot and he eats cheese and yogurt instead. I'm still a little sad about it, though.