Hoping for the best preparing for the worst

yesterday I had my first OB appointment and Well..... not good news... the sac was measuring 5 weeks and baby 6 weeks 2 days.. no heartbeat.. I should have been 7 weeks 2 days.... so I have to play the waiting game and go back next week for an ultrasound to see if there is any change.. if not I have to make a choice to wait it out or DNC.. prayers are appreciated.