Why are there still two red lines after using a test strip for human flow?

Patient's question:

Hello! Could you please tell me the results of the ultrasound after one week? The uterus is anteverted, with normal size, uniform, no significant abnormal detected, and a linear dark area was found in the uterine cavity, about 5mm thick. No abnormalities were detected in the bilateral adnexa. It has been more than half a month now, and I have been using a test strip, but why are there still two red lines. I am requesting help.

Doctor's answer:

Hello. A week after the surgery, an ultrasound examination was performed. It showed that string-like dark areas were detected in the uterine cavity. The thickness was 5 millimeters. It is considered that there may be fluid accumulation in the uterine cavity. Anti-inflammatory drugs can be taken, as well as Yimucao Granules or Xinshenghua Granules, to promote the discharge of blood stasis. Now, it has been half a month since the surgery, and the early pregnancy test showed positive. This is because the levels of estrogen and progesterone in the body increase after pregnancy. The hormone levels in the body have not returned to normal after the surgery, which is normal.

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