No fetus yet worrisome

Morgan

I’m 6w3d today. I have another ultrasound on the 29th. Yesterday we could only see the yolk sac and the gestational sac. Should I be worried that I have a blighted ovum? Or wait till my next appointment when I’ll be 7w6d. I could’ve ovulated later than I thought but I didn’t get my first blazing positive till the 6th of November.