proscar early side effects? expert advice appreciated

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Hi guys,

i'm 21 and pretty close to a nw3. i've been taking minoxidil for almost 2 years now and i started taking proscar yesterday.

I'm wondering when the side effects are expected to kick in, i've been experiencing dull aches in the testes but imo I think this is more likely to be a placebo (due nerves about the side effects ironic) as its really only day.

On the other hand it could be my body initially adjusting to this drug its never encountered before. Another query I have is how long 1.25mg of finesteride will remain in the body (I noticed after waking up this morning the ache was absent (more evidence of a placebo) though it returned later today). If its doesnt last 24h I may take it before bed rather than in the monrings

I think it would help,my mental state, if i got clarification from an expert or people with experience.

PS i'm a science student so scientific explanations would be welcome also