Period and letrozole

Hello,

So question. My period is usually 3 days, has been for a long time 1 day of light, 1 of medium-heavy, 1 light. This month my period is dragging on for what seems like forever, I am on day 6, but there has mainly only been blood when I wipe, and a little on my pad every now and then. I started letrozole 3 days ago and had assumed I would have stopped by this point.

I guess my question is is it normal for my period to drag out, do I keep counting these as just light days ( because they have all been light days) and will still bleeding some effect the job of the letrozole?

I hope all of this made sense 😊

Thank you