Possible blighted ovum

Mi

Hi ladies..I went for an ultrasound a week ago and the ultrasound only showed a gestational and yolk sac and they think they saw a fetal pole but it wasn’t confirmed...They said I was measuring 5 weeks 6 days and maybe that was why...today I am supposed to be 7 weeks dr did a bedside ultrasound and it only showed the sacs nothing Inside😓 She drew my blood and saw that my levels doubled from 2 weeks ago and wants me to get a transvaginal in two days...has this happened to anyone? Where abdominal us didn’t show much but vaginal did? I don’t even know what To think anymore not sure if I’m even pregnant😩