I went for my 1st ultrasound today. They say i am 9 weeks, but the sac only appears to be 6 weeks. This means 1 of 2 things. The baby stopped growing or my dates are off. Is this a common thing???? Talk about being worried. My last period was June 23rd, and ovulation occurs 2 weeks after this, so I'm not sure how I could already be 9 weeks. Any advice? Did anyone go through the same thing? Should I be worried and concerned? I AM!!!!!!!!!!!!!