A blood draw that does not result in a pregnancy but is pregnant again within a few days may be due to the short duration of the pregnancy, which was not detected. Depending on your needs, you should choose to keep the fetus or have an abortion. For some women who are pregnant for a short period of time, the possibility of not detecting pregnancy during the test is considered to be related to the early time of the test, at which time the fertilized egg has not yet fully implanted, so the hormone level in the body does not fluctuate too much. The main purpose of the blood test is to check the level of HCG (human chorionic gonadotropin) in the blood to determine whether a woman is pregnant. If a woman is diagnosed to be pregnant after the blood test and ultrasound, she should choose to retain or abort the baby according to her needs. If she chooses to retain the fetus, she will need to undergo regular checkups to ascertain the development of the fetus in the uterus. If she chooses to abort the fetus, she needs to go to the gynecology department of the hospital.