When does embryonic biochemistry generally occur?

Patient's question:

Could you please tell me how long after intimacy does a miscarriage typically occur to be considered a biochemical pregnancy? I've been bleeding for a month, and today it finally doesn't look clean anymore. I wonder if it's all over now.

Doctor's answer:

Biochemical pregnancy occurs around 30 days into a woman's pregnancy, and recovery after a miscarriage typically takes about 30 days. Therefore, sexual activity should be avoided until after her menstrual cycle has returned to normal. It is not advisable to engage in sexual contact too soon during the recovery period. Generally, bleeding after a miscarriage subsides within about seven days. If it lasts for 30 days, this may be related to poor uterine contractions or the presence of blood clots in the uterine cavity. In such cases, it is recommended to return to the hospital for a follow-up examination, including an ultrasound, to assess the recovery of the uterus.

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