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it really depends on how you used it. If you test too soon, less than 8-10 of conception, hCG may not be at a sufficient level for a strong positive result and this may cause faint line. maybe your not pregnant, try more.. |
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Using different tests detect hCG at different levels also, from 20MIU to 100MIU or more. So, low test sensitivity may can cause too. |
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dilution of urine specimen due to frequent urination or consumption of liquids. First morning urine is recommended for pregnancy testing as it contains the most concentrated presence of hCG. |
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chemical pregnancy is also another cause. It means implantation takes place and hCG is produced for a short time. However, this is followed by miscarriage before any other pregnancy symptoms are detected. |