It is also possible to test for pregnancy after your period has been delayed for a month. Early checking for pregnancy is usually done by drawing blood or checking urine for HCG levels, which usually rise soon after the fertilized egg has been laid. If menstruation is regular, with cycles of around 28-30 days, pregnancy is not usually checked until a month after menstruation has been delayed. In this case, it may be that the woman’s period is irregular, which causes ovulation to be delayed, so the pregnancy test is also delayed. There is also a situation where the result of the previous test is a false negative, or when using pregnancy test paper to check, there is a problem with the method of operation or the test paper, and there is an error in the result, etc. This may also occur. After checking out the pregnancy, you can use blood HCG, ultrasound and other comprehensive judgment of the time of pregnancy, the development of the fetus, and then you should also do regular checkups.