When will these small black hairs grow into regular hairs and fill on the area?

[Zach Loar]

I've been on Dutasteride for 3 months now and noticed these tiny hairs pop up after 1 month in. They disappeared after month 2 and now on month 3 they came back again, but more came with them. They're noticably darker than before.

Regime:
Dutasteride 0.5mg
Monoxidil
Dermaroller 1.5mm