Sac a week smaller than baby...should I be worried?

Am

My husband and I went in for my first ultrasound appt today after getting pregnant through IVF. I’m 7 weeks 2 days, baby is measuring 7 weeks 1 day. The nurse practitioner said she was concerned, because the gestational sac was measuring 6 weeks. Has anyone had this happen and have a successful pregnancy? Any tips on what I can do? This was our last embryo we had left to transfer and our last pregnancy ended in miscarriage.

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