Faint positives for a few days and now period?


I posted pictures of my faint positives on this app and got a lot of responses, everyone said they can also see the line. I’ve been testing like crazy every day because 7 months ago I had a miscarriage. I took 7-10 tests in the past few days and all were faint positives but today I started to bleed heavy, took another test and it’s negative. Is this a chemical miscarriage ? Or is it possible something else made my tests have a faint line ?