Twin pregnancy only one heartbeat😭

Cara

I had an early scan done 23rd December showed I was expecting twins one measuring 7 weeks and 6 days, other 8 weeks both with heart beats.

Had a scan done today and it showed only one baby measuring 10 weeks and 4 days. While the other is 8 weeks 1 day with no heartbeat. Feeling upset and gutted that I did something wrong.