The number of days to detect pregnancy depends on the type of test chosen and cannot be generalized. If you choose the blood hcg test, the concentration of chorionic gonadotropin, or hcg, in the blood usually rises to the detection level 10 days after sexual intercourse, and you can detect whether you are pregnant by checking the blood hcg; if you choose the urine hcg test, the urine hcg can be detected a little later, usually 14 days after intercourse. If you choose ultrasound to confirm the diagnosis, the detection time is relatively later, usually the intrauterine gestational sac can be seen through ultrasound examination after more than 40 days of menopause. In addition, women with positive results on early pregnancy test paper or pregnancy test stick are still recommended to go to the hospital to have their blood hcg levels checked under the guidance of an obstetrician for a more accurate pregnancy diagnosis, and to confirm whether the pregnancy is intrauterine or not, ultrasound examination is also required after 40 days of menopause. It is recommended that women should not be overly nervous after pregnancy, keep a happy mood, eat a light diet, eat more folic acid-rich foods to prevent fetal neurovascular malformations, and have regular pregnancy tests.