After artificial insemination, menstruation is delayed for 2 days, the test paper is negative may not be pregnant, but also may be pregnant after a short period of time or the test paper expired, resulting in not measured. 1. not pregnant: artificial insemination usually need to monitor ovulation to determine the time of insemination, the time is more accurate, menstruation delayed for 2 days and still can not be detected, then there is a higher probability of not pregnant. 2. Short duration of pregnancy: If a woman is pregnant after artificial insemination, even if the duration of pregnancy is short, she may still not be able to show it on the test paper, at this time, the woman can go to the hospital to test the blood HCG, or after a few days to use the test paper to test again. 3. Expired test strips: If the test strips are expired or damp, there may not be a way to detect it correctly. In this case, even if the woman is pregnant, it may not show up on the test strip. If the period is delayed for 2 days after artificial insemination and the test paper is negative, it may mean that there is no pregnancy, or the pregnancy is undetected, so you can observe for a few days, and if the period still does not come after a few days, you can test with the test paper again or go to the hospital for a checkup.