Letrozole and bleeding

So I had a hysteroscopy last month. My period came on time by itself this month and I started Letrozole CD 3-7.

I am now on cd 10 and still bleeding. Less than a period, more than spotting...bright red.

I have PCOS, but this has never happened before. Periods are usually 4-5 days.

Anyone else on femara have this issue?