kellymom says that children often self wean at around 12 weeks pregnant because the milk changes taste (wonder what it changes to). Was this the case for you. Its early days for us but I'm getting very sore nipples, only feeding twice a day so bearable so far but hoping DD (20 months) will self wean soon!
I was around 4 months pregnant when DS1 self weaned, though at this stage my nipples were no longer sore. He did have the odd feed after that and after DS2 was born but not twice a day as before. (Have to admit I really regret not feeding him for longer and not offering feeds at bedtime. DS1 is very jealous of his brother and I think had I carried on feeding him regularly after DS2 was born he would have felt far less jealous.)