I was Bf my Ds3 and was also pg. I found I seemed to have no milk at 10 weeks pg. Ds had been pulling off and getting really grumpy at booby time. He weaned that night I cried.. It does happen but I have also heard if you perservere past those couple weeks your milk supply can pick up again
I have read that as well, that once you get past the troubles you can continue. Have you checked out the ABA site to see if there is any literature on this?