Sac measuring 6 days behind baby!?

Lindsey • Angel baby 7/23/2019🌞🐶👶🏻 Ectopic loss 11/5/2020 🌈💔 Dog momma to 3 lab babies - Dakota, Tucker, Paisley. Goat mom. Chicken mom.

Has anyone had this before!? Doctor said she’s hopeful but it could go either way. Baby is measuring 7w5d with a heart rate of 127. Sac is measuring 6w6d. Help! 😫