Couples after intercourse, 10 days or so can be measured pregnancy, this time to go to the hospital gynecology blood HCG test. If you buy your own pregnancy test paper or pregnancy stick test, it is more accurate to test 16 days after intercourse, because when couples have intercourse, women may not have ovulated, so there will be a delay in detecting the time of pregnancy. If the test is too early, the HCG hormone in the urine has not yet risen, then there may be a false negative reaction. Similarly, if the blood HCG test is taken 7 days after intercourse, it is considered that the fertilized egg has not yet attached to the bed, so the HCG hormone has not risen.