So so so so confused 😐

It’s been a year since my “first” miscarriage and I did 6 pregnancy tests recently that had faint lines on them. Anyway, yesterday (Saturday) I got sent to the out of hours doctor (UK) and they did another test that had a very faint line on it. The reason I ended up there was because I started bleeding (this started on the Friday) a pinky red but it was only when I wiped. On the Saturday morning I wiped again and had a black blood clot but no red and it was similar colour to my spotting I’ve had since tuseday the day I first took the test. I’m so confused because A. I’ve had no red bleeding which should have been the colour for my period (which it always is) or the miscarriage the doctor SUSPECTED it to be and B. the tests are still positive (I know hcg stays in your body a while). I have just finished bleeding the black blood which has been thick and it’s only been 24 hours which is unusual for my periods if it is