congratulations!!!!!!!
now, I can understand how you would not know.
I had a cat once that everyone involved said it was a boy when I got it. I never actually looked.
Over time I started to think with great despair that my original boy cat was a homocat. he was constantly mounting the new boy.
one day I couldnt find the new cat, so I went looking for him fearing that maybe his a-hole had finally been ripped open and he was laying somewhere bleeding to death.
I finally found him, he was under the couch with what I originally thought was a rat or something, then I realized there were 6 rats,, he had kittens.
looking back on that situation, I now tend to think he was a girl all along.