Should I stop treatment because I am shedding after 1.5 years of Rogaine usage?

Hello, is this normal? I've been using Finasteride and Rogaine for my frontal hair loss since 1/19/2019. Recently I've increased the amount of Rogaine I use x2 about 2 weeks ago (still not even a half of the Rogaine bottle cap) and I started shedding again. Is it normal to start shedding after year and a half of usage just because I increased the amount of it? Should I decrease it or should I stop completely?