What reason does the test paper fail to detect pregnancy

Patient's question:

No

Doctor's answer:

It might be pregnancy. You need to go to the hospital for hCG blood and urine tests, and an ultrasound examination. If it's not pregnancy, you need to receive progesterone injections or other medication treatments. You should strengthen your nutrition and avoid picky eating. Drink more bone soup. Avoid spicy, alcoholic, and other stimulating foods.