20 days after abortion, the pregnancy test is still weakly positive may be caused by human chorionic gonadotropin HCG has not fallen to normal, but also may be related to incomplete abortion or trophoblastic diseases, etc.. 1. HCG has not decreased to normal. HCG will rise after pregnancy, HCG after abortion declined rapidly, but the recovery to pre-pregnancy levels need a time process, generally about 20 days after the abortion down to normal, but there are individual differences in personal recovery, so there will be 20 days after the abortion of the pregnancy test stick weak positive performance. 2. Incomplete abortion. 20 days after abortion, the pregnancy test is still weak positive is likely to be incomplete abortion caused by the HCG did not fall to normal, usually abdominal pain and vaginal bleeding phenomenon, can do ultrasound to confirm the diagnosis. 3. Trophoblastic disease. Trophoblastic disease secondary to abortion will appear HCG abnormally high, test paper weak positive and accompanied by abdominal pain and vaginal bleeding phenomenon, need to be combined with blood HCG test to clarify. There may be other reasons why the pregnancy test is still weakly positive 20 days after the abortion, and it is recommended that you seek medical attention as soon as possible.