Background: Thyroid dysfunction is one of the most common endocrine disorders affecting women of reproductive age group including pregnancy. Over the past several years it has been proved that maternal thyroid disorder influences the outcome of the mother and fetus, during and also after pregnancy. Methods: A total of 385 pregnant women satisfying selection criteria attending the antenatal care during the first trimester were studied. The demographic details were collected and TSH, free thyroxine and free triiodothyronine were estimated. Results: The present study showed a higher prevalence of thyroid abnormalities which is 33.51% in pregnant women during the first trimester. Conclusion: The prevalence of thyroid abnormalities was significantly high in women with family history of thyroid abnormalities whereas no statistically significant difference was noted with maternal age and parity. Screening of women in early pregnancy for thyroid disorders is beneficial in preventing adverse fetal and maternal outcome.