Subbing. I'm 12(ish) weeks pg with #4, nursing ds2, age 17 months.
I nursed ds1 all through my pg with dd, and tandem nursed them for a full year, until ds1 self-weaned at age 3.
I would have nursed dd through my pg with ds2, but she self-weaned much too early...at 16 months. Gave me no small amount of guilt, but what can you do? "Child-Led Weaning" means you let the child lead, right? Not like I could force her to continue! Anyway, I still struggle some about her being so young when she weaned, but I've come to peace with it. There's a purpose in everything....
So far, ds2 is still going strong, although he does not seem to be as strongly attached (to nursing--he is very well attached to my dh and me!) as my firstborn was. I don't know exactly how things will play out over the next few months. One day at a time, and trying to take my cues from him.
I will say that I'm struggling right now--he seems to be constantly chewing on me! Very painful, and I suspect it is equal parts my increased sensitivity and his dealing with the awareness that something is different about my milk. My supply seems to be pretty good so far.....
I also am coming to realize that it has been a loooooong time since I actually nursed a toddler, and I need to make that adjustment mentally/emotionally and perhaps physically. I didn't have the toddler nursing phase (much) with dd, so it's been awhile.
It would also help me, I'm sure, to figure out what I really want for myself (regarding his nursing and eventual weaning) and why... Not that it would change how strongly I feel that allowing him to continue the relationship for as long as he needs is what is best, but right now I feel somewhat ambivalent.....
I think part of my brain is "holding back" just in case he does wean early, like his sister did. I don't want to feel that guilt and (in a sense) rejection again. And yet I can't say that I particularly enjoy nursing through pregnancy....so far it has been bearable, but I remember it getting to the grit-my-teeth point with ds1, before dd was born!
But it is what i feel strongly that I need to do, want to do for my son, for as long as he receives a benefit from it. Sort of hard to describe, all the different emotions and sensations, worries, fears and joys I'm experiencing.
I know that if anyone on Earth can understand it completely, you all can!