no heartbeat at 7weeks and 6 days?

hello sa lahat, share lang po.. according sa first ultrasound q last nov18. d pa makita c baby then after two weeks ultrasound ulit, awa ng diyos nakita c baby pero sad pa rin kasi wala sya heartbeat i am 7weeks and 6 days pregnant... nag aalala aq baka mauwi sa miscarriage... follow ultrasound ulit after 1 week... please need some advise to cheer me up... thanks in advance...