Empty Gestational Sac


Just had my 1st ultrasound today. 5w3d from LMP but I ovulated a week late so I figured I was 4w3d. The US showed a 4mm gestational sac which they said measured 4w6d but no yolk sac or anything. The tech wasn’t worried and said it’s still very early. They wouldn’t give me a picture and said come back in 2 weeks. Here’s the pic I took off of the screen...does this look ok? I have a history of chemical pregnancies and mc’s so I’m nervous. This will be baby #2.