It is also possible to be pregnant if the test paper is getting lighter and lighter, and the darkening of the test paper is mainly related to the peak of HCG (human chorionic gonadotropin). However, care should also be taken to rule out biochemical pregnancy and ectopic pregnancy. Since the HCG content in urine at night is not as high as in morning urine, the color of the test paper will be different at different times. In addition, some women do not handle the test properly, which may result in errors. It is recommended to consult a medical professional to monitor progesterone and ultrasound. If the progesterone is not low and the fetus is developing normally, there is no need to worry too much. Generally speaking, the HCG level gradually decreases around the third month of pregnancy. Therefore, the color of the test paper will also become lighter. Women who need to prepare for pregnancy are advised to go to the hospital promptly if they test positive for HCG and have an ultrasound to further determine whether the pregnancy is intrauterine and the development of the fetus. Consult your doctor if you have any discomfort.