The white mark on the early pregnancy test paper may be caused by short time of conception, failure of conception and other reasons. 1. Short time to conception: women with normal menstrual cycles take a blood pregnancy test about 10 days after intercourse to determine pregnancy. However, HCG (human chorionic gonadotropin) appears later in the urine and pregnancy is detected with a pregnancy test about 2 weeks after intercourse. So when the time of conception is short, early pregnancy test paper can appear white marks, can be reviewed under the guidance of the doctor. 2. Failure to conceive: Although intercourse during ovulation will improve the chances of conception, there is also the possibility of failure to conceive, which makes the white mark on the pregnancy test paper, and soon after menstruation, you can continue to prepare for pregnancy after menstruation. When the white marks appear on the pregnancy test paper, you can find out the cause under the guidance of your doctor and deal with it positively.