Had a 6 week U/S and only a yolk and gestational sak

Paola
I had a U/S on Monday at what we thought based on my lmp 6weeks and 3 days, we were hoping for a heart beat or something that showed a little baby in there. the ultrasound tech think I'm not as far along as 6 week but most likely 4/5 weeks, so they suggested to go back I two weeks. To say that I'm disappointed and sad is an understatement! I still feel sick and my bobs feel tender and bigger each day.
 I just know that either in two weeks we will find that there is a little light of life or that I will have to prepare my self for sad news. 
Tell me your story, did you have something similar happen and found out you still had a viable pregnancy?