Just to chime in - When I found out with my first I went in for my "7 week" ultrasound (turns out I was closer to 4 or 5 weeks) and we had nothing but a yolk sac. Needless to say, no ultrasound pic and a lot of nervous doctors... I had to do multiple blood draws to test that my hormone levels were increasing and waited 2 more weeks to get another ultrasound - and in the meantime was having spotting and a little nausea. Well, at the second ultrasound everything was fine, normal heartbeat, and they pushed back my due date 3 weeks!!!!
If you aren't miscarrying, then you are probably going to be just fine! Try to relax, because stress isn't good for any pregnancy. Every woman is different, and your body and pregnancy may or may not look exactly textbook. Unfortunately, this process is out of our hands.
Needless to say, now with #2, I'm waiting to go into the midwife.