If it's threatened miscarriage, can a pregnancy test detect it after a few days?

Patient's question:

If it's threatened miscarriage, the pregnancy test can disappear after a few days of using it. Thank you. On the evening of the 14th, I had some bleeding, but I didn't know if the baby was still there. In the last two days, there was only a little. Today (the 17th), I tested and got two lines, but they weren't as clear as before. Is it still there or not? Thank you.

Doctor's answer:

After a miscarriage, the hormone levels in the body tend to rise more slowly. Some may take about a month or so, but if you haven't fully miscarried, there could be a possibility of slower hormone level rise in the uterus, except for abnormal conditions. Based on your description, since you cannot confirm the condition of your uterus at the moment, it is recommended that you visit a hospital for a color Doppler ultrasound to examine the specific situation inside the uterus and carefully observe how to preserve the pregnancy. If it is possible to preserve the pregnancy, it is advised that you actively pursue preservation. If preservation treatment is not feasible, it is recommended that you promptly undergo a uterine evacuation procedure.

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