The interactions vary greatly form person to person, age, metabolism, fitness... we all respond differently.
Finasteride has mildly similar properties to Spiro, but is generally used as relief for MPB... Spiro is an anti-androgen...
The effects do take time, some quicker than others, remember that Natal females take many, many years to reach female body shape maturity... for us we have to teach our bodies to undo all those years of testosterone doing the opposite

FWIW I started at 50'ish and (apart from hips and bum) doing OK.. but its a slow process.
Chat with your endo about the journey, it may be a bit early yet though..
Oh welcome to Susan's too xxx
L Katy xxx