Has anyone ever had twins measure drastically different and everything turn out fine?

Kaleigh
I'm 10w6d today and at 7w6d, I found out I was having twins. But baby B was measuring 5w6d, a full two weeks behind baby A. I go back for another ultrasound this Thursday (will be 11w2d) and I'm terrified about something being wrong with baby B and was just wondering if anyone has ever had a similar situation and it all turn out alright.