Got pregnant when dd was 14 months. She started switch feeding about three days after conception, which we recognised in hindsight.
Milk supply dipped slightly but never dried up. I have read though that its as high as one in three that lose supply completely?
Got colostrum at 25 weeks. Colostrum poos. Wow. Lucky I had awesome nappies.

Still feeding at 26 months. She is currently having one big feed in the morning, one before her nap, one after and a quick token suck before bed.