I second what Quinns momma said. Also, you need to know that there is no rush to make any decisions. If you are uncertain of dates or unsure of what you want to do, wait and request a second ultrasound in 2 weeks. I have been where you are and that is what I did. There is no danger to you unless you have an etopic pregnancy in which case you need to act right away. From your post that does not sound like the case. Good luck to you.
At 8 weeks they will be able to see the HB, baby and yolk sac.
Anything earlier than 5 weeks and usually no HB is detected but they often see the yolk sac.