I just recently nursed, while pregnant until the 20th week, when my milk
supply decreased, and I  had enough of sore nipples and increased nausea.
I'd like to note that while I was pregnant and BF I also had varicella and
strep, and though I felt worse for it, it was better to have my daughter
sit down with me rather than  having to chase her around all week while I
felt like hell.

The first time I BF my son while pregnant with my daughter and  I weaned
him because I actually felt contractions.  I was told by a nurse that if it
weren't for the contractions, I could probably continue.  I think each
pregnancy is different and the woman has to judge how she feels and what
her body is telling her.

My LLL Leader just recently (in the last two years) had a miscarriage while
bf and then had a pregnancy during which she nursed until week 30+ because
the fetus wasn't gaining weight.  She delivered a healthy baby in the end.

Nofia