Hello. I Had My Medical Abortion On June 15. It's

Hello. I had my medical abortion on June 15. It's been 26 days and my pregnancy test is still showing up positive. The second line is very faint, but It's still a positive test . I had a two week follow up appointment on June 27th to confirm the abortion was complete and they said everything looked fine. I am on birth control (the mini pill). Is there a chance I could be pregnant again or does it take some time for the hormones to leave my system?