New Mother Ultrasound no baby??

Shailee
Today me and my fiancé went to get a ultrasound. The lady said that she thinks I'm 5 weeks and 5 days.. but we didnt see anything maybe a SMALL sac but no little heart beat or no small speck of a baby... I told them that I have been getting bad cramping lately but no bleeding.. is it to early to see the baby? My fiancés friend said his girlfriend seen something at 4 weeks..