You're barely at the half way point! You need to wait a full year. You can't even assume that it is not working at this point, the biggest mistake you can make is not continuing treatment atleast up to the 1 year mark.
Elaborate on your male pattern baldness being more aggressive? If you are shedding lots of hair that is common when taking finasteride. Some people shed a lot early in treatment, some people shed a lot half way through treatment, some people shed early - stabalize - and shed again. Everyone responds differently to treatment, but the only way your hair improves its appearance is through shedding, because after a shed your hair has to regrow and its thicker regrowth that you want right? This typically cannot be achieved in 3-6months, that is why everyone says to wait a full year to judge whether its working for you or not.