They had waited a few years before they wanted to even try to start a family. Hermione wanted to finish her N.E.W.T.s - albeit from the shelter of Shell Cottage for most of the year except for the exams - and Draco wanted to finish the work on the Manor and get his N.E.W.T.s as well. The latter upon the insistence of Hermione. Draco had insisted they were legally married before they tried anything in the first place. Hermione just wanted to be with Draco. So she had allowed Narcissa Malfoy to plan a small and private winter wedding that same year. And yet, three years later they still hadn't settled on what last name they were going to use for their family. But they had set that discussion aside once they discovered Hermione was pregnant.