Normally the color of the pregnancy test should get darker and darker as the duration of the pregnancy increases, and a lighter color is highly suspicious of a miscarriage. If it is just about 30 days after menopause, it may be a biochemical pregnancy. If it is already 40 days after menopause, it should be considered that the embryo has stopped developing, which means the possibility of an induced abortion. After this happens, it is best to go to the hospital to do a vaginal ultrasound to see the situation of the uterine cavity, biochemical pregnancy can not be seen inside the uterine cavity of the embryo, at this time you can take a blood test to check the value of HCG, if the HCG can be reduced to normal, that means that biochemical pregnancy. If the HCG drops to normal, the pregnancy is biochemical. If the ultrasound shows that there is an embryo in the uterine cavity and it has stopped developing, the pregnancy needs to be terminated at an early stage.