Yes ..you will face difficulty conceiving if diagnosed with PCOD.But then it depends on how mild or acute the PCOD is as it varies from person to person.But good thing is there are treatments definable for overcoming these issues.Best thing is they test your hormone levels and based on the lab test results of these,a treatment paln will be offered to you.For Ex.if your FSH and LSH hormones are out of sync,then you may be put under Metformin treatment.
Sometimes with diet, if overweight it can reduce the symptoms of PCOS. Those of normal weight normally have a bit harder time, because diet doesn't do anything. I suggest to seek advice from your gyn on this for further treatment.