Ultrasound and dates

Hi guys. So I’m pretty worried and want to know if anyone else has been where I am and had a positive outcome. I thought I was 6+5 and I had an ultrasound yesterday that showed only a sac, no fetal pole or yolk and it’s dated at 5+5. I’ve had two blighted ovums before and I’m trying not to worry but I can’t help it. Have any of you had this happen?