Can the time of coitus be calculated based on the ultrasound report if there is menstrual irregularity?

Patient's question:

Hello, doctor. I have been experiencing frequent itching and a bad odor for a long time, with a curd-like discharge. I hope it can be stabilized and the odor can be eliminated. Can irregular menstruation be determined based on an ultrasound report to decide the timing of sexual intercourse?

Doctor's answer:

According to the ultrasound, it's not about calculating the delivery time. Because after intercourse, the lifespan of sperm is about three days, so it's impossible to determine when the delivery will occur. We can only say that a gestational sac of 0.6 cm is equivalent to a 48-day gestation period, meaning that counting back 48 days from May 23rd gives the date of the last menstrual period. It's impossible to determine when intercourse occurred. Different causes lead to different symptoms, and patients need to go to a formal, top-tier hospital as soon as possible for systematic and standardized examinations based on their specific conditions. This is the only way to diagnose the condition accurately and achieve a quick recovery.

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