I had very heavy bleeding earlier this year at 6 weeks, after it settled down i had an ultrasound and they could only find the sac via an internal ultrasound. At the time they measured the sac and predicted I was only 5 weeks pregnant. They told me i needed to wait another 2 weeks until they could do another ultrasound that would be more conclusive. (I lost my baby a week later.)

So i would wait a couple more weeks...i know each day will be long and agonising.

Another option is to get your HCG levels checked again...if they are still rising that should be a good sign.

Good luck...i am thinking of you