The purpose and objectives of the study is to assess the effect of hyperhomocysteinemia on the first trimester of gestation in women with uterine myoma. Relevance. Biochemical and hormonal changes that occur in the myometrium and the body of a woman as a whole, without preventing the onset of pregnancy, can have a significant effect on the formation of the chorion and the clinical course of the gestational process, provoking complications such as miscarriage. Material and research methods. To achieve this goal, we examined 182 pregnant women, of which the main group was 98 pregnant women with a verified diagnosis of uterine fibroids, which took place before gestation, but did not prevent pregnancy. The comparison group included 84 pregnant women without anamnestic indications of gynecological pathology and signs of fetoplacental insufficiency. Results. We made an attempt to highlight the features of the content of homocysteine and thyroid hormones in pregnant women with uterine myoma and the influence of these indicators on the onset of gestation. Considering the results obtained, we indicate that pregnant women with uterine fibroids and without a tumor had significant differences in individual values. Conclusions. In women with benign tumors of the uterus that are pregnant, the most common conditions in the first trimester are mild anemia and genital tract bleeding. Half of the observed pregnant women with uterine myoma have hyperhomocysteinemia and, in some of them, subclinical hypothyroidism. This must be considered when preparing for the pregnancy of these women.