Baby B

I just got back from the doctor and one of my twins baby b is in a smaller sack. The doctor said that it wouldn't survive. Baby b has the faster heart rate at 117 and is bigger. I think baby b is a fighter. Baby A had a heart rate of 93. I'm a week earlier than I thought so I'm only six weeks. Has this happened to anyone? I would really like honest answers about whether the small twin made it. Thank you!