Abstract: Unintended pregnancy is usually referred to both unwanted and mistimed pregnancy. It is estimated that each year almost 80 million women experience unintended pregnancy worldwide, jeopardizing the health and well-being of women and their families. The aim was to assess the determinants and health related outcomes of unintended pregnancies. Subjects and method; Across section and quasi experimental designs were used in this study. The study was conducted at the Maternal and Child Health clinics in Zagazig city. The first sample consisted of 800 females selected by simple random sampling. The second sample; consisted of 60 women for whom the intervention program was implied,. Tools include the interviewing schedule and the educational program for the intervention. Results revealed that almost one third of women (32.0%) were exposed to unintended pregnancy, they had a mean of age, and higher percentage of gravida and para ( 4). They were significantly more likely to have low education, insufficient income, antenatal care utilization (28.5%) compared to those who had intended pregnancy (69.3%). Meanwhile, they were more apt to have pregnancy, labor and neonatal complications. A statistically significant improvement was observed in the post-intervention knowledge of women, in all tested elements about the unintended pregnancy, OCPs and IUD and ECPs. Conclusion; almost one third of women were exposed to unintended pregnancy. Age, educational status of women, economy of the household, children ever born, contraceptive use were significantly associated with unintended pregnancy. Trial of abortion and adverse maternal and newborn outcomes were associated with unintended pregnancy. Recommendation; the educational program should be integrated in the family planning clinic in the study setting and in similar ones.