Alberto,

I have just reached the 13 week milestone too.
This initial 13 week process reminds me of a saying my mother-in-law used to describe having children; 'The days are long, and the years are short.'
So it is with growing a beard - I chastise myself on a daily basis about lack of growth, odd patterns and more but when I look back a few weeks the difference is profound.

I think you should grow a big, full beard.
Before long you will have full even coverage over your whole face. You have a powerful mustache and more beard will only support it; it has great character!
For weeks I have questioned if my wife was really on board or just supporting me. This weekend I used my electric razor to clean a couple of hairs from my cheeks. My wife heard the razor buzzing and rushed into the bathroom with grave concern that I may be ending my beard's life! She confessed to me; she likes it, and would like it stay!

-Jonathan