Please help!! Possible blighted ovum

My first ultrasound they couldnt see the baby a heart beat or yolk. so they did blood work my levels came back that they are rising so i had thought everything was normal. my docotor called and said she thought i was having a blighten ovum pregnancy, but sceduled me for another app. At That ultrasound the sack was measuring 7 weeks and a day but no baby no heart beat and no yolk still.. My heart is breaking as my next ultrasound is tomorrow and i am now 8 weeks and 5 or so days. I am very worried and scared and would just like some more information and to know if anyone has gone through the same thing.