I had an US today due to possible miscarriage scare. I am 6 weeks and 6 days. I was told that the sac is small for being 6weeks and 6 days and that is measuring to be about 5 weeks. (Almost 2 weeks less) they said that everything is fine if I calculated wrong but I did not. I am 100 % sure that i am as far along as I am. The RN then in other words said that there is something wrong such as the embryo not developing correctly. Has anyone gone through this and if yes can you please share your outcome.