No Gestational sac

Jess

Hi ladies, i have had low hcg levels so the Dr sent me for an early scan....approx just over 5 weeks and was told she could no see a sac. I am really sad right now and waiting to see what next steps are going to be 😭😭 Anyway i was looking at my scan. Does anyone get what any of it means? why does it have measurements? for a sac