Can pregnancy be detected 7 days after cohabitation?

Patient's question:

Female, 53 years old, her body gradually doesn't feel well, and she doesn't know what's wrong. It seems like she lacks energy. Question: Can pregnancy be detected 7 days after sexual intercourse?

Doctor's answer:

Generally, it is not possible to detect pregnancy through a urine test until about a week after cohabitation. After the egg is fertilized, pregnancy can be detected as early as 7 days later, but this is done by testing blood HCG at the hospital to infer how pregnancy occurred. However, having had sexual intercourse does not prove how or when fertilization and implantation took place.
Then, the patient needs to maintain a balanced diet, follow a regular sleep schedule, and regulate physical and mental health. In daily life, it is important to keep a positive mood, eat light, soft, and easily digestible foods, drink plenty of water, and consume more vegetables and fruits.

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