bleeding? Positive pregnancy test then negative pregnancy test?

i got a positive pregnancy test the other day and then started bleeding the next morning i done another test but had already been to the toilet before so was unable to go so well so the test was done with only a few drops of urine but came out negative? i went to the doctor who done some test and said i have a UTI but that the bleeding was prob a miscarriage, i have suffered 7miscarriages before this and this seems nothing like my other miscarriages but also seems nothing like a period?

me and my partner have been TTC for over 24months now and on clomid for 4months, we have a scan booked for wednesday morning, but the bleeding is slowing down, it was never very heavy to begin with and no clots, some pains but nothing sever...

it only seemed to last two days the bleeding and it was more a dark red/purple colour?

i am unsure what this could have been? could it have been a miscarriage? could it have been implantational bleeding? could it have been a very werid period?

please help after the doctor said she was sure it was a miscarriage we have been beside ourselves, i have also been put on bedrest till wednesday which is hard when i have a 2 and a half year old please help

i need someone advice on this one