6w1d Yolk Sac NO FETAL POLE


I had my ultrasound today and I’m supposed to be 6w1d according to lmp. All my other ultrasounds with my other kids showed a fetal pole at 6w1d. And today all they saw was a yolk sac??? She said I could just be earlier than expected but I’m wigging out!!! I had a miscarriage last September and I just hate not knowing!!!! Anyone else have this at 6 weeks and have a happy outcome?