FJ - Let your SIl know that it is still early. I was 6weeks when I had my u/s with this one and there was only the sac and that only measured 5weeks. At the 7week u/s bubs was seen even tho an internal u/s was required with this viewing too. Did they do an internal u/s? Even if they did, with my one they didnt see anything with the 1st u/s. Tell her to have another BT done to see if her levels have risen which is very reassuring when the u/s doesnt show what we would like them to show. GL to your SIL, I hope she gets better news soon.