Still bleeding cd10

Kristin • 3+yrs infertility / 👶🏻 Dec ‘21 / NTNP

So I took letrozole on cd 3-7 and I’m still getting heavy spotting that doesn’t seem to be letting up. I took at least 3 pregnancy tests before taking the letrozole but I’m still nervous as to why this period seems to be lasting so long...

Thoughts?