Potential blighted ovum

Feeling really down lately , on monday 7+3 I went for scan for there to only be a sac measuring 6+2 and a yolk sac , no fetal pole, I know when I ovulated because I was tracking and I deffs implanted late as had implantation bleeding a day after period was due. I can't get in for another scan till 16th jan , going by LMP I'm 8 weeks 2 days today and I'm feeling sick on and off and it's making me angry thats it's probably for no reason :( the day after my scan I had blood tests done and hcg came back at 31876 so not feeling very hopeful right now :(