Confused

I had a miscarriage and d&c on sept 3. We've been trying to get pregnant again since I think the 6th was our first Time since it happened. I understand that after that your body is still adjusting back to normal. I have been taking pregnancy tests since about 2 weeks after and they gradually got lighter and lighter then all of a sudden one day they started getting darker and darker and are still to this day dark. Well today af decided to show after a fairly dark and obvious pregnancy test. My doctor says its normal and that my body is still going back to normal but I'm not convinced. I should not still be having positive pregnancy test and the start of af if I am not pregnant. I'm very confused and don't know what do. Can anyone give me some sort of advice or anyone been through this. I know it's kind of a long shot since NOBODY really ever responds to people unless it's some bs post a selfie post not when someone actually NEEDS help and is genuinely confused and does not know why to do