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If there were 2 lines faint or proper it means the test is positive.If the path lab report is also of urine then the faint line is also suggestive of positive pregnancy
.If it is a blood test
of Beta HcG
and if that shows low then only you can say that the HcG is low.The test is positive so you are pregnant and the hcg levels increase as the days of pregnancy increase.No reason to worry please consult a Gynaecologist for further examination and treatment.
All the best.