Poocatcher - congratulations 
Adventures is quite expensive (think I paid £17 for mine) but I figured DH is always buying electronic gizmos and saying it's "for the family", this is me doing research "for the family". Plus it's the only pg book I'm getting this time (and I got loads of hand me downs last time). I imagine you'd be able to borrow a copy from a local LL group though, or library? Or maybe ebay?
NAR4, I've just got to the bit about health/research, it seems it's only "draining" if you're malnourished (as in medically rather than "oops I forgot to eat breakfast again"), in which case you can lose needed body fat. It's a very common concern apparently for those not in the know, but more recent research says otherwise.
Things I've learned from the book:
BF while pg doesn't harm your bone density, but actually helps to recover it.
BF reduces the risk of cancer, the more you bf, the more protection.
For the existing DC it's only a problem if bf'ing is their main source of nutrition, as the qty decreases.
Tandem feeding can provide a lot of mothers an excuse to slow down a bit with the DC and have some special time with the older child (this is why I'm really keen to keep going) or as a trio.
Tandem feeding is not as uncommon as you'd think, and apparently a lot of people have been doing it "secretly" for decades, they just didn't want to be judged.
Still reading about how it affects the bump...so far it seems to be back to "same as normal pg as long as you're not malnourished".
The chapter "dealing with doubters" just says it's like any parenting choices - basically it's up to you and DH how you want to raise your family, and people have to try and accept it or mind their own business (MIL has been skeptical about most of our choices, but she's had to back-track on everything so far...we'll see how bilingualism works out
). It also says a lot of mothers keep their tandem feeding private, and there's nothing wrong with that, though if you can find supporters it makes it all a much more positive experience, obviously.
I think from my perspective if anyone asks I tell them I still bf DD, but I don't go around broadcasting it (even if I seem like a bit of a nutter on here!)