Still pregnant

I had an abortion mid July. When I went back to do my one week check up they did and a ultrasound and pregnancy test everything looked fine than they gave me the birth control shot. At the end of July I took another pregnancy test. And it came back as a faint positive. I took another 2 weeks ago more faint than the first one. And I took another one 3 days ago it looks the same as the one I took 2 weeks ago. After I had my abortion I had bleeding for 2 weeks. I did have sex after my abortion once but I was thinking maybe the pregnancy was to early for them to see on the ultrasound/pregnancy test so they said I was fine. But I've also been bleeding again for about the back 2/3 weeks and the bleeding stopped today. What could be going on. PPH said to take another test at the end of this month. Could this possibly be a miscarriage or from the abortion still. Please do not judge me. I'm just looking for advice thanks