Why is there bright red blood flow 48 days pregnant

Patient's question:

Medical Description: Female, 24 years old. 48 weeks pregnant. Since yesterday morning, there has been some brown discharge from the lower body. Just finished an ultrasound this morning, and the fetal heartbeat is very strong, but the yolk sac is very blurry. Additionally, the lower body has been continuously flowing pinkish blood.
History of Treatment and Effect: First pregnancy, no previous diseases.
Desired Help:
1. I want to know what the cause of this is.
2. Will it affect the fetus?
3. Could it be a threatened miscarriage?

Doctor's answer:

Hello, you are 7 weeks pregnant and have experienced vaginal bleeding. It is recommended that you pay attention to your condition, as there are multiple possible scenarios:
It could be that pregnancy has made your cervix more fragile, and slight irritation or exercise could cause minor vaginal bleeding. The bleeding caused by this is usually very light, often just spotting, with a color similar to that of your menstrual period. In this case, simply maintaining good hygiene is sufficient.
If the bleeding increases, persists for 1–2 days without relief, or is accompanied by abdominal pain, you must seek medical attention promptly to rule out possible miscarriage or ectopic pregnancy.
During your visit, the doctor will inquire about the bleeding and abdominal pain, perform a gentle gynecological examination to aid in diagnosis, and may order blood tests (such as hCG, progesterone, and thyroid hormones) and ultrasound to further evaluate the situation and guide subsequent treatment.

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