should i be worried

The date of my LMP was september 1, it is now october 10. I got a positive result with a hpt and dr. told me I should be 5-6 weeks. When I went to the dr. the urine test was neg. so they did a blood test. The test came back positve but my hcg level was only 21. I have never been pregnant before, and this is something that has been a major suprise I really don't know what to expect. My dr. told me the hcg level was very low...should I be worried???

[amberd5191]

Are they going to redraw the test?

hCG levels in weeks from LMP (gestational age)* :

3 weeks LMP: 5 - 50 mIU/ml
4 weeks LMP: 5 - 426 mIU/ml
5 weeks LMP: 18 - 7,340 mIU/ml
6 weeks LMP: 1,080 - 56,500 mIU/ml
7 - 8 weeks LMP: 7, 650 - 229,000 mIU/ml
9 - 12 weeks LMP: 25,700 - 288,000 mIU/ml
13 - 16 weeks LMP: 13,300 - 254,000 mIU/ml
17 - 24 weeks LMP: 4,060 - 165,400 mIU/ml
25 - 40 weeks LMP: 3,640 - 117,000 mIU/ml