Can I avoid a propecia shed having already shed using rogaine?

[ppxrare]

Hi, So I have been on rogaine-nizoral for 2months. I'm 19 years old going to be 20 soon. So far I have a lot of hairs growing on my hairline but none yet on the back or front (guess they need more time).

So I decided I will go on proscar gradually by cutting it into fifths and using the transition method. I had a definite and noticeable shed for 3-4 weeks which has thinned out my frontal region. I hope in the coming 2 months these hairs and new ones will grow back due to the rogaine.

So since I have already shed using rogaine, if I go on proscar will I experience another massive shed again or will the miniaturized hairs will have already fallen out??

Another thing, do you think me going on proscar so young may have an effect on my height, im also worried that if i feel some signs of gyno that even if i stop it may not be reversible.

As far as side effects go, I don't mind a small decrease in libido only with the gear working the same as before. I will be going on 1/5 proscar once per week for 2 weeks, then twice per week for two weeks, then 1/5 proscar every third day, and if I am fine with that then eventually 1/5 proscar EOD.

Is it possible to see results at 4 months after starting proscar, since I have already used rogaine and nizoral for 2months so I would assume that usually hair growth is due to rogaine and all what propecia will do is maintain the remaining hair.

Hope someone can answer most of my questions