i had an ultra sound, and although my regular obgyn suggested that i may actually be a little less than 5 weeks based on my hcg levels which have been doubling normally so far.. the doctors at the hospital who did my ultrasound when i went into the er for some cramping on my upper left side that has resolved and only ocassionally appears have me feeling so scared!! they said they think im havig an ectopic or empty sac bcause the us only showed the gestatitional sac and no yolk or baby yet... what can i make of this.. im seriously stressing.. and im not sure how far along i am..