I found this reference on nursing while pregnant through a
breastfeeding.com article - I've quoted the abstract below:

J Hum Lact. 1993 Jun;9(2):83-8.
Breastfeeding during pregnancy.
Moscone SR, Moore MJ.
Abstract: Questionnaire data were gathered on the experiences of 57 women
who were concurrently pregnant and breastfeeding. Respondents provided
information on nursing and weaning patterns, informational and emotional
support, and pregnancy history. The main reasons given for continued
breastfeeding after conception were the emotional needs of the child or
child-led weaning. Forty-three percent of the children continued to
breastfeed throughout the pregnancy and tandem nurse after the birth.
Mothers who initiated weaning cited breast and/or nipple pain as the
principal reason. Most weanings initiated by the children occurred during
the second trimester, corresponding with the diminution of breastmilk. The
infants born to these mothers were healthy and appropriate for gestational
age.

Kirsten again: I nursed through my second pregnancy, and my son (22 mos
older) nursed quite a bit for comfort even though he was eating a lot of
foods.  I found that my caloric needs were staggering, but manageable as
long as I stayed on top of it.  As a plus, I had a terrific appetite, and
none of the nausea that plagued me through my entire first pregnancy.  Also
emphasize hydration, as dehydration intensifies uterine contractility.

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