Ten days after coitus, you can’t usually find out if you’re pregnant by doing an ultrasound.
After intercourse, the male sperm enters the vagina, passes through the cervical barrier and enters the uterine cavity, where it combines with the egg in the fallopian tube to form a fertilized egg. The fertilized egg will be deposited in the fallopian tube about 7 days after fertilization, and thereafter it will begin to further differentiate and develop. If a woman with regular menstruation has intercourse during the period of ovulation, she will only be able to see the gestational sac and determine pregnancy through ultrasound at the earliest when the pregnancy lasts for 35 days, that is, 3 weeks after the coitus.
If the patient wants to know whether she is pregnant as soon as possible, she can check the blood level of human chorionic gonadotropin, and the earliest time to know whether she is pregnant is about 7 days after intercourse; she can also take a urine pregnancy test, and the earliest time to know whether she is pregnant is about 10 days after intercourse, but there is a certain degree of false-positive possibility.
If patients want to know whether they are pregnant as soon as possible, they should undergo standardized examination under the guidance of professional physicians, so as to avoid delaying the condition and leading to adverse consequences.