I am 8 weeks tomorrow. I think my dr is more concerned because not only is the CRL smaller but the sac is also smaller. He also said statistically, it’s 50/50 chance of it continuing.
As for you, your sac must be normal size so I am sure you have nothing to worry about. Try not to google, each situation is so different. You sound like you have two healthy embryos and I’m sure it will be fine. Take each day as it comes, and pray they both stick. X