I believe Mary had an angel visit and tell her. So in her case I beieve it was a miracle birth.
According to New Labour Mary's fiancee Joseph would have been arrested and put on the front cover of all the tabloids. !! and probably had his movements restricted so Mary would not have been able to give birth in Bethlehem.
Might consider doing a NEW LABOUR BIBLE where the story is re-written to take on board the bizarre and nasty society that NEW LABOUR have created in the UK. The Wise Men for instance would have been put in a detention centre - and their "gifts" would have been consfiscated....
Any more ?