TTC- Primolut and Letrozole

Hi guys,

I am an overweight PCOS and taking primolut and letrozle for the 1st cycle.

After taking 5 days primolut, I finally saw the sign of period, however it is extremely light. My pad is pretty much clean and no blood. ( I can only see blood if i wipe down there..sorry if too much info).

I am wondering how you guys determine/count CD 1? ( My FS asked me to take letrozole from CD2-CD6). However if my " period" will keep like this ,light and little. Should I commence taking letrozole? It seems the period cannot last long in terms of the current flow. What if this light flow will only last 2- 3 days? Do I take letrozole ?

Has anyone experienced the similar problem?

Thxxxxxx