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What causes a faint line on a pregnancy test? Non-developing pregnancy.

Non-developing pregnancy.

Due to chromosomal abnormalities, embryogenesis defects, and infection in the early stages, fetal development may cease. In this case, the fertilized egg remains in the uterus for some time, and the hCG begins to decrease, so the test shows a weak second line.

An important feature: a non-developing pregnancy is indicated by a repeated faintly colored test after a preliminary clear positive result.