No it doesn't! I'm answering this both personally as a PCOSer and professionally. I can't tell you how many women get told they will never conceive naturally with PCOS, and sometimes end up with unwanted pregnancies as they don't worry too much about contraception.
If your periods are irregular, or you are having a longer cycle, then the frequency that you ovulate is reduced. Which makes getting pregnant a little trickier.
Some women find they need a bit of help, but not usually to the extent of IVF.