Congratulations! I hope once the shock wears off that you will all be able to celebrate the new addition to your family!

It sounds like your step-daughter was in major denial, but it is actually quite possible for a woman to be well along in a pregnancy and not know it. I used to work with a young woman who it happened to. A nurse called me from the hospital telling me that she was asking for me to come in the delivery room with her. I told her she had the wrong number! I had seen the girl a few days before. She had gained weight, but not in a way that made her look pregnant. She looked healthy as she had needed to gain a few pounds! After some explaining from the nurse, I drove to the hospital and was present for the birth of a beautiful, healthy 6 pound baby girl! (who was adopted by a couple who had been waiting a decade for her!) The nurse told us that at least once a month a woman came in thinking she had appendisitis or some major stomach problem and left with an infant!