Generally speaking, it's safe to breastfeed throughout the entire pregnancy, then tandem feed after the birth if you wish. There's some more detailed information on safety here. Many women find their supply drops, and some will dry up altogether. Some children self wean due to lack of milk, or a different taste, and some will continue through, or even dry nurse. Women often find nursing more uncomfortable and might cut down feeds, or initiate weaning themselves. On the other hand, some carry on as normal! It really does vary.
My personal experience is that I've had a bit of a supply drop, but if anything, Alice is more keen than ever. I don't enjoy it as much as I did, and it's often sore, but I think it's still important to her, and I know if we can make it through, it will be better once the baby comes. I really want to tandem feed!
