I am in this boat as well! I had no breast changes while pregnant with my son, and discovered by way of my own research that I had IGT after I couldn't make more than maybe 9 to 12 ounces daily--tops. That was while supplementing with every galactagogue under the sun, including domperidone, and pumping every hour for fifteen minutes. In the end, we did have a successful breastfeeding relationship, as soon as we feel into a routine. He always nursed like a champ, and it was still excellent closeness and bonding and I was able to get him those 9-12 ounces. We had donated breastmilk for a while, from two sources. I had something of a problem with one of the sources, however, because it was from my sister in law, with whom there have always been mutual bad feelings and competition. (She was trying to conceive, and I conceived by accident three weeks before her, and sharing the limelight was difficult for her.) That was, I think, harder on me emotionally than the good it did my son, but the other source was fine. I stopped pumping at about a year and we weaned at about 16 months with no tears--one very paltry possible silver lining to a low supply is easy weaning.
So now I am 22 weeks pregnant with number two and have had no breast changes again, so I'm bracing myself. I have read Making More Milk and found it very helpful. My plan for this time around is very similar to a lot of yours: alfalfa during pregnancy, and I am also taking fennel and fenugreek (every time I burp it tastes like Italian sausage... sorry, gross.) Goat's Rue starting at week 36 or so, and either Shatavari or Ddomperidone after birth. I might skip the Domperidone, as I wasn't actually able to be sure that it helped, having implemented it at the same time as a rigorous pumping schedule. I will be pumping again, starting right away, and supplementing as soon as seems necessary. My midwife says she can likely get donated milk.
One thing I'm sure you all figured out, but I just wanted to mention again is: let's not forget that breastfeeding is just as much about the emotional benefits for both as it is about the nutritional benefits. Any nursing at all will provide those, and we have to remember to look at a breastfeeding relationship as successful and happy as long as it feels good for all involved, even if it isn't the baby's only source of nutrients. We need to give ourselves a pat on the back for trying as hard as we do, and know when to relax and just enjoy our babies. One specific thing I don't see mentioned here, that was important for me (and again I bet you all figured this out, so I'm just saying) is that if you supplement with a bottle (we did starting at about three weeks) to use the bottle FIRST. Then nurse to top the baby off. You're probably going to pump after nursing anyway, (right?) and that way, the baby's feeling of fullness and content and peace comes from you. Everyone just seems to feel better that way. That helped me so much. It's also mentioned in Making More Milk.
And finally, a question. Sorry if this was addressed and I missed it somehow, but is anyone planning to pump while pregnant to store up some colostrum? I know I will need to supplement, and I'd like this baby to have as much of my milk as it can. I've read varying things about pumping while pregnant. There are a lot of dire warnings about it saying that it can lead to preterm labor, but at the same time, many many mothers nurse through pregnancy, and don't go into preterm labor, and I figure I can always stop if I have a strong contraction. I've also ready that it won't help that much, because colostrum will not pump well, due to its being thicker than milk. But I think any that I can store would be beneficial. Any thoughts on this?
Also, regarding being looked down on by the breastfeeding community, that was a big issue for me. The LLL leader that I contacted in the first weeks had me in tears each time I spoke to her because all she would say was, "just keep nursing." I would tell her that I literally spent 22 of every 24 hours with a pump on my nipples, and she said literally this to me: "yeah, it can feel like a lot." And that was all. I think maybe I just had a not-nice or not-well-informed leader, but I definitely got a bad impression. It's hard to be in this position where some hard-core breastfeeding mothers will just assume that you can't possibly be trying hard enough (no matter that I spent thousands of dollars and many thousands of hours on this) and meanwhile, formula feeders think you're crazy for bothering. Most everyone is not that judging, of course, but I have had some bad experiences.
Anyway, it's nice to have found this community. Thanks all, and sorry for being a late addition!