A temporary increase in shedding at the start is expected with treatments that act on the hair cycle. Resting hairs are released early to make room for new ones moving onto a faster cycle, so for a few weeks you can shed more, not less.
Transcript
Here's the thing almost nobody warns people about. Start something that works on hair. And for the first few weeks, you may shed more, not less. It's called a shedding phase. Resting hairs get pushed out early to make room for new ones on a faster cycle. It looks exactly like failure, and it's often the opposite. It's also the point where most people quit.
It looks exactly like failure, and it is the point where most people quit. It is also why the honest assessment window is months rather than weeks, and why a doctor who measured your scalp at the start can tell a shedding phase apart from a treatment that is not working for you.