Are theses levels normal ?

Taylor
Nov 19 -1300. 4 weeks 
Nov 23- 1403. 4 weeks 4 days 
Nov 25- 2870. 4 weeks 6 days 
Nov 30- 4800. 5 weeks 4 days
Do these levels seem normal ? 
I went to the doctor on Tuesday and had a ultrasound I was 5 weeks 5 days the gestational sac got a lot bigger but since couldn't see a baby I'm really worried just wondering what other people think.. Was it too early to see a baby ?