How to know how many days the embryo has been pregnant

Patient's question:

The last menstrual period ended on June 1st, and she hasn't had another period since. Three days after her period, they had sex using withdrawal. Her period didn't come at the end of the month, and in early July, she used a pregnancy test and it was negative. In mid-to-late July, they had sex without a condom, and on August 10th, she used a pregnancy test and it was positive. At the hospital, an ultrasound showed a thick-walled, anechoic area in the uterine cavity, measuring about 0.5 x 0.4, similar to a gestational sac echo, but no visible embryo or yolk sac was seen. So, which date did she actually get pregnant?

Doctor's answer:

Hello, generally, the embryo starts to form around week 5 of pregnancy. Between weeks 6-7, the embryo can be clearly seen on ultrasound. It is recommended that you get adequate rest during the early stages of pregnancy, avoid heavy physical labor, maintain a regular lifestyle, and avoid staying up late. Regular prenatal check-ups are important. Routine screening for Down syndrome is typically performed between weeks 15-19 of pregnancy.
The occurrence of gynecological diseases not only affects a patient's health but can also lead to the development of other gynecological conditions. Therefore, it is best to visit the gynecology department of a hospital for a leukorrhea test to identify the cause and receive targeted treatment. Pay attention to dietary adjustments, consuming light and easily digestible foods, and avoid spicy, stimulating, or cold foods.

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