For most women, the earliest time to check for pregnancy is through a blood test around 7-10 days after conception.
A woman who wants to determine whether she is pregnant can have blood drawn to test the level of human chorionic gonadotropin in the blood, i.e., an elevated level of HCG can only be used as a diagnosis of pregnancy. Of course, a urine pregnancy test can also be done so as to detect pregnancy.
Blood and urine tests such as urine pregnancy tests can only determine whether a woman is pregnant or not, but not whether it is an intrauterine or ectopic pregnancy, and a definitive diagnosis can only be made through further ultrasound examinations. If the ultrasound examination reveals the presence of a gestational sac in the uterine cavity, it can be diagnosed as an intrauterine pregnancy, on the contrary, it may be related to ectopic pregnancy.
It is recommended that women go to the hospital for examination about 15 days after coitus to get a more accurate result, and if necessary, they can delay it appropriately to find out whether they are pregnant or not.