Ok... a couple of people had told me that Ukyou DOES know about 
P-chan... so I send this note earlier:

       Well, all, it looks like I really @#&@$*&@# up this time
so I am going to ask you all to please delete 'A Lesson In Love
Part III" and to wait for me to rerelease it.  I want to be
accurate, from a manga standpoint, and it looks like I made a
big blooper. SOOOOO I will work on it. Sorry bout that... back
to the drawing board.
-Misa

Then I got this from Kun-chan:

Someone sent me a note saying the Ukyou already knows Ryouga is P-chan.
Since WHEN? I read through all the manga and rewateched my videos...
if she knows, I sure as heck missed it. Can someone give me some info
please? Thanks in advance.... Misa

She doesn't know... Not in any of the manga that I've ever read... And
I'm only missing manga 37 because it's not out yet. :p

And I -was- right! YAY!! I am still going to fix up a buncha stuff, but
I am going to leave that part about Ukyou and Ryouga still in there 
because it is important later on... WHEW!!! I just want to point out
that I am trying to make the story more like the manga, where, frankly,
I find Ranma to be a bit more affectionate as we often see what he is
THINKING and not just what comes out of his mouth in the manga... so if
in the anime (which I have only seen what VIZ has put out, in contrast
to the manga, which I have seen a lot of) is different from what I 
write, sorry. I am sort of more partial to the manga. SO Ukyou doesn't know
about Ryouga/P-chan in THIS story (until I make her ^_^) because it relates
to the manga. Thanks for your patience! Part IV should be out in a couple
of days.....

Glad I could help. ^_^ Ask me any question about Ranma 1/2, and if I can't
find it in the manga, I'll make up and answer myself. ^_~ Well, maybe.

Kun-chan...