The previous poster is right in that a fibroid op, like any uterine surgery (such as D&C's or whatever) MAY slightly increase the risk of a uterine rupture in later pregnancies. However - this does NOT necessarily mean you have to have a cesarian birth if you subsequently get pregnant.
First off the risk of a rupture occuring is VERY small (like 0.3%) and in fact smaller than for women who have had previous c-sections.
Second most so-called uterine ruptures are in fact fairly harmless openings called "windows" where the scar tissue slightly separates; (the word "rupture which is very scary, implies a huge ragged wound but that is rarely the case).
Even in the very worst case scenario there should still be time to get an epidural up should you need a c-section, a rupture is rarely life and death.
One final point should you have a baby in future - it's best to avoid any kind of induction (especially with oxytocin) as that CAN significantly increase the risk of a rupture (with or without a uterine scar). You would probaby find that most women you spoke to who had c-sections for uterine ruptures actually had induced births.
Best of luck with the surgery !