Light bleeding

Hi everyone, I have a question. Tomorrow I’ll have had 8 days of light, bright bleeding. I don’t know what it is. My last period was on March 13th. I’ve been off the pill for a while now, I think about 2 months. I also had light bleeding a week and a half ago, which stopped after 3 days, and now there’s light, bright blood again. A few days before my expected period, I took a test and saw a faint line, but I went to the doctor and thought I wasn’t pregnant. Now I’m supposed to test again around April 10th, but 4 days before my period, I had my blood checked and the results were not pregnant. Now, on Thursday, the week before April 10th, I had light bleeding again and also passed a large clot. What could this be? It’s been almost 8 days and I’m still bleeding. Can I take another test, or is this a miscarriage? I’m worried about the bleeding. Who can reassure me? Can I still be pregnant? Do I need to wait more, or is this a miscarriage? And why are the blood tests negative? Does it matter that I tested 4 days before my period? Can I still be pregnant? I’ve never experienced this before. My previous miscarriage was when the fetus died in my womb at 9 weeks, and I had a curettage. I do have symptoms of pregnancy. If this is really my period, how can it last so long? Who can reassure me please? Thank you.