Small gestational sac 8 weeks, positive experiences?

Hi! I am 8 weeks today and yesterday I had my first ultrasound. The baby had a strong heartbeat at 157, and everything looked good, except tht gestational sac is measuring behind by about two weeks.

I have an appt next Thursday (10 days from first ultrasound) to check that the gestational sac is continuing to grow. I am praying it will catch up fast!

Does anyone have any positive outcomes after being told their gestational sac was measuring so far behind? ❤️🙏