Hcg levels too low?

Dawn
My doctor called to ask me to repeat bloodwork because my hcg levels are "too low". When I googled levels for 4 weeks pregnant, I was in the middle of average. Anyone else had concerns with low levels, or know if 201 is too low for 4weeks?? The nurse said I should be at least in the thousands by now. That's not what I found when I googled it. Help.