When you have a polycystic ovary, is it true that you will have a difficulty having a baby?

Not always. Some women with polycystic ovarian syndrome (pcos) have infertility due to not ovulating or egg quality. Most women with pcos can have children. Some conceive with no fertility treatment, some need medications like metformin, Clomid (clomiphene) or Femara (letrozole), while others need in vitro fertilization (ivf). Pcos women often respond better to fertility meds. See a fertility md if you want to have kids.
Sort of. Because many women with pcos have less frequent ovulation (fertile egg production) it may take them longer to become pregnant. There are medications like Clomiphene that can induce ovulation and may be helpful for some women with pcos who are having trouble getting pregnant. It is also suspected there may be other factors in women with pcos that interfere with getting pregnant.