Another funny Christmas story

It was the doctor's last patient consultation of Christmas Eve. A mother came in with her young daughter and asked if he would examine her because she had been showing some strange symptoms, including a significant increase in weight,sickness most mornings and a number of strange cravings. He checked her out very carefully and eventually told the mother that her daughter was unquestionably pregnat. At which news she protested very strongly. "Don't be ridiculous, my daughter has never been with a man" The girl confirmed that this was true and added that she had never so much as kissed a man. The doctor studied the girl very carefully, then quietly stood up, walked to the window and stared out of it. Suspecting the worst, the mother asked if there was something wrong. "No not really" replied the doctor. :It might just be a coincidence but the last time this happened a bright star appeared in the east and I don't want to miss it."