We had our antenatal scan this morning where they were looking specifically to see if this baby has the same brain abnormalities as dd. Very pleased and relieved to say that as far as they can tell the brain looks fine. There was definitely a corpus callosum and absence of that is one of the main indicators of Aicardi Syndrome (which dd has). So it looks like all is well.
Just wanted to say thanks again to all those who were so supportive when I was freaking out after seeing the geneticist a few months back. At least now I can relax and enjoy the rest of my pregnancy (now I'll just have to wait until the baby is born before I start analysing every move!).
Oh - and it's another girl!