twins

hey guys so i found out i’m having twins last week 1 had a heart beat and 1 didn’t it was just the yolk sac .. today they both had a heart beat just the one that was just the yolk heart rate was 87 bpm and only measuring 5 weeks and 5 days and I was soo discouraged and in shock because they told me to basically expect the worse I feel . and iknow I should have asked but my mind just went blank . anyone had any good news out of a situation like this ?