Genevieve, the nurse at my gyn's office had the same procedure done as a young girl.  She had one ovary and most of her other one removed.  She went on to have 4 kids!  Your other ovary will pick up the slack and will produce just fine!  Take care and Godspeed.
~Tascha

I had a friend who had a cyst the size of a grapfruit removed from an ovary.  She got pregnant within three months of the surgery and so far, her pregnancy is going well.

I just wanted to boost your thoughts of children even higher. My cousin had an ovary removed at 15, she now has 4 children. So be careful!!!!!!!!!!!!! HEE HEE HEE
Carrie

Oooh an organ recital, I love it!  I had a grapefruit sized ovarian cyst removed (no pain that I recall, just irregular periods) when I was 16, and some of remaining ovary removed as well.  I don't know what type of cyst, they didn't tell me squat. I am guessing it was complex. I stayed on the pill until I wanted to get pregnant at 23. I went off the pill and about 8 months later conceived.  I have three kids.
You might think I am a nutbar, but I have something to add.  I am less than calm to begin with and when I was trying to get pregnant, I went to a hypnotist/naturopath type fellow who helped me a lot...thoughts such as "Let it go, relax, I will get pregnant no problem" stuff like that.  I read somwhere when you are freaking out about trying to get pregnant you can even cause your tubes to spasm.  I tried to get rid of stress and I cut out sugar, booze, coffee, junk food, etc. I stopped smoking and I walked a lot.  I sure should have kept up that regime!
LOTS of people have babies with one ovary.  My one has worked fine for me all these years. I am now 48, no menopause symptoms but having surgery Friday...because of fibroids and complex cysts (darn).  But I did have my kids...  Try not drink too much of that great French coffee, I have been drinking gallons of coffee the last few years and I kinda wonder....I've had a lot of stress too...
Love and very best wishes from Katie