of course it's hard to say...
the problem with finasteride is that it deals with hormonal issues which are completely different for everyone in every experience. the most obvious answer would be that your body had experienced a hormonal change, having less acne as a result. later on your body adapts and finds a balance (bringing your acne back to normal). as for shedding, there is a lot that can be said for that, but in my opinion shedding is much more subjective. your shedding may in fact not be worse or better. we all shed hair, male pattern baldness or not. if you have male pattern baldness you tie it to hair loss immediately. you could be shedding and re-growing, shedding in a normal pattern. who knows. i really feel that acne is a better indicator of hormones that how many hairs you can count on your hands when you are showering.