The main conceptual idea from the provided text fragment is that Konstantína Spyropoulou was pregnant during the last two Christmas holidays. The title and snippets like " 'Τα δυο τελευταία Χριστούγεννα με έβρισκαν έγκυο'" (which translates to "The last two Christmases found me pregnant") clearly indicate that the article focuses on this news.