Early pregnancy test paper is recommended to be used after the delay of menstruation and can be used to detect pregnancy in about 10-14 days. After the fertilized egg is laid, the embryonic trophoblast will secrete human chorionic gonadotropin, and the principle of early pregnancy test paper is to detect human chorionic gonadotropin in urine to determine whether it is pregnant. The early pregnancy test can also give false positives or false negatives, such as those for staphyloma and choriocarcinoma. If you want to confirm pregnancy as soon as possible, you can go to the hospital for a blood HGH test. To determine intrauterine pregnancy, it is also necessary to undergo an ultrasound diagnosis, where a round or oval gestational sac can be seen in the uterine cavity after 35 days of menopause.