Pregnancy cannot be detected at 10 days. Because it takes about 12 days for the sperm and egg to unite and reach the mother’s bloodstream and then the urine, 10 days is too short a period of time and there may be a certain amount of error when testing. However, it is possible to test for human chorionic gonadotropin in a blood test, which can be done as soon as 8 days after intercourse, and the results are equally accurate. As long as the result is outside the normal range, it means that conception has occurred; if it is within the normal range, it means that conception has not occurred and you should be patient and wait for your period. If you want to test with a pregnancy test, you must wait until 12 days to do so. If you have your period during this period, you do not need to test, which means that you are not pregnant.