Ectopic pregnancy.
This is a dangerous pathology when the embryo attaches and begins to grow outside the uterine cavity. HCG in such cases rises more slowly than during normal pregnancy.
If, in addition to a weak line on the test, a woman is bothered by pain in the lower abdomen or bloody spotting from the genital tract, she should immediately see a gynecologist.
An important feature: a distinctive feature of the test for ectopic pregnancy is the absence of dynamics of color change and clarity of the second stripe.