The urine pregnancy test time after intercourse, usually about 15 days later, 9 days after intercourse usually use the urine pregnancy test paper can not detect whether the pregnancy. The urine pregnancy test paper detects HCG in the urine, if you are pregnant after intercourse, the embryo will settle in the endometrium on the 6th day and start to form the trophoblast cells to secrete HCG. 15 days after intercourse, the HCG level in the urine is higher, and only then can you usually use the test paper to measure to determine whether pregnancy has occurred. If the test is done 9 days after intercourse, the low level of the hormone in the urine can easily lead to false negatives, so it is usually not possible to measure it with test strips. Sometimes a blood HCG test can be done 9 days after intercourse. If a woman suspects she is pregnant, she needs to take rest, get enough nutrients, and go to the hospital for a blood HCG test in a timely manner.