My DS1 was had just turned 2 when I got pg with DS2, was 2y8m when DS2 was born. He was feeding prob 2-3 times a day (morning cuddle, afternoon sleep, going to bed). He persisted in feeding all the way through my pregnancy, which I mostly gritted my teeth for, because my nipples were so sensitive, and it was awful at times, but no interest in weaning himself. He went without a bf while I was in hsp, but wanted to feed when I got home, at which point my milk had come in, had one drink then said "yuck, it's hot", and never bothered again.

I would think that if a little one is going to wean when you're pg, it's mostly likely to happen sometime in 2nd tri, when your supply typically drops. But like most of this parenting stuff, there apparently aren't any rules