18M 4 months on fin. Is my medication working?

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The first pic is one month into treatment and the second is 4 months into treatment. I got really thin on month 2 and then regained some recently but still now I can see through my scalp in normal lighting which was never the case even before treatment. Is this normal 4 months in? I’m on 0.1% topical finastride and 1.25 mg oral minxoidil daily. I was wondering if I should just switch to dut since I’m 18 and probably have agressive hair loss.