Measuring 6w 6d worried

EJane • Boy Mom x2

Im measuring smaller than i should according to my lmp.. i went for an Us today and Gest sac, yolk sac was present but no fetal pole heartbeat... now i have to wait a week for a repeat to see if it will prgress or result in MC. I had done an us 2 weeks ago measuring 5w and since then there was some growth but not “normal” growth.

Anyone relate? Have successful pregnancy? Im so worried and this is my 2nd pregnancy (we have a 14m old)