Is it normal for some women to have trouble conceiving?

Abnormal but common. At least 10 - 15% couples have difficulty conceiving. See a reproductive endocrinology and infertility (rei) specialist if ttc without success, for testing and treatment. Conditions that affect fertility include low egg supply, irregular ovulation, hormone problems, uterine problems or damaged or blocked fallopian tubes. Almost half the time there's a sperm issue as well, or it's the only problem.