Yolk sac looks big

Emma

Hi all I had a alscan last week at 7 weeks, I've read so many stories about if the yolk sac is big it could mean you will miscarry, mine looks quite big to me and I'm really worried, what do you all think? I had a blighted ovum in June and now I'm really worried 😔 does it just look big because its zoomed in? Thanks for any replies 😊