13 days after intercourse test paper white plate is also possible pregnancy, can be in the doctor’s guidance and then review. Regular menstruation is generally 2 weeks after intercourse can be used to detect pregnancy test paper, test too early in the urine HCG is not elevated, may be measured out of the negative results. Irregular menstruation, ovulation time is delayed, urine or blood HCG elevation time is delayed accordingly, so 13 days after intercourse test will also appear white plate. It is possible to be pregnant if the test paper is white on the 13th day after intercourse, so you can retest in a few days. You can also measure the level of blood HCG, blood HCG rise earlier than urine HCG, 10 days after intercourse can be determined by checking the HCG to determine whether or not the pregnancy, is currently the earliest and most accurate method of examination.