Testing Question

Gi

I had to induce a miscarriage last Tuesday due to no heartbeat. This is my first miscarriage. I am still bleeding on and off, mostly brown. I have never had a normal cycle and had to take ovulation tests everyday to get pregnant the first time. So my question is, when do I start taking ovulation tests again? When the bleeding has completely stopped? I take a pregnancy test every day and still get a very, very faint positive. Should I wait til that is negative? Thank you!