The hairs you are seeing in the shower are being shed because of the hairs that are growing underneath the original. The follicle is now producing hair and it has to have somewhere to grow,dont be alarmed, that is the natural cycle, it will become darker and longer than the previous one. I have learned by experience,it does take a while to see the results.
Now the other problem, a few percent of men will have libido problems, waking up in the morning and no morning glory cant maintain erection , wont last too long, weight gain,hard to workout,mood swings. You have to find out what is more important,hair or sexlife. I myself cant tolerate it, I did take propecia for 6 months and couldnt take it anymore. I hope this helps