A white panel on the test paper on the 13th day after ovulation is generally more normal. A pregnancy test on the 13th day after ovulation is usually not able to detect pregnancy, as the level of human chorionic gonadotropin in the urine is low at this time, so it is usually undetectable, and a blank result may occur. If you want to detect pregnancy, you can seek medical treatment for blood tests, through the blood HCG test can understand the changes in human chorionic gonadotropin, you can also wait for the menstrual period delayed for 3 to 7 days before using the test paper test, usually can be detected. If you are pregnant, you must pay more attention to rest, ensure adequate sleep, and avoid exertion.