After conception during intercourse, the phenomenon of frequent urination can occur after about 10-20 days when the fertilized egg is laid, mainly because the uterus enlarges after pregnancy and presses on the bladder in front, and the pressure on the bladder causes the urge to urinate. Therefore, clinically, the phenomenon of frequent urination will occur, but it will not be accompanied by urinary urgency or painful urination, which is different from frequent urination caused by inflammatory urinary tract infections. Ten days after sexual intercourse, the fertilized egg has been laid and the syncytial trophoblast cells begin to secrete chorionic gonadotropin, and a blood chorionic gonadotropin test can reveal an excessive value at this time. If the value is greater than 25 U/L, a diagnosis of early pregnancy can be made, or you can wait patiently; if your period is three days overdue, you can use an early pregnancy test.