Had a 4-5 week ultrasound and..?

I am around 6 weeks pregnant, well will be in the next few days, about a week ago i went into the ER because i was cramping and had spotting (it was not severe just scared me because i had no spotting with my daughter) anyways they did an HCG test which came back nearly double from the labs my OB had done on me a day and half previous, and the Ultrasound located my Gesational sac in the right spot and measuring close to 5 weeks(which was correct) what I am wondering is that all they usually see on a scan that early. With my daughter i did not get an US until i was nearly 9 weeks.