Blood can be drawn to check for pregnancy after 10 to 15 days of intercourse for irregular periods. Women with irregular periods can be tested to determine if they are pregnant by extrapolating the timing of the test from the time of intercourse. 10~15 days after the last intercourse, blood can be drawn to test HCG (human chorionic gonadotropin) to determine whether pregnancy. Early pregnancy test paper is later, after 15 days after conception to check, early pregnancy test paper two bars, it represents pregnancy. In addition, you can take folic acid during the preparation stage, which helps prevent fetal cardiovascular malformations and other effects. You should develop good habits in your diet and life, and avoid frequent late nights and hard work.