6w ultrasound blighted ovum scare

I had an ultrasound today showing gestational sac and yolk sac that measured 6w1d but we didn’t not see a baby yet. I’m worried about a blighted ovum. However my levels have been doubling appropriately. I have another ultrasound Monday to check if baby is there. Can this be normal? I saw my first baby earlier than this on screen with a heartbeat.