6wks5d scan - irregular gestational sac

After two miscarriages and my fourth transfer (5-day embryo), I had my first scan today at 6w5d.

CRL is measuring perfectly on track and we saw a heartbeat flicker.

However, the sonographer said the gestational sac looks irregular (not smooth in outline). She wants me to come back in a week to check in.

I’m not sure whether to guard my heart or feel hopeful given baby is measuring right with a heartbeat.

Has anyone had an irregular sac this early and gone on to have a healthy pregnancy? Is there anything I can do while we wait, or is it just limbo?

Thank you