The main tests of this writing was defining pregnant vagina ecosystem at hospitalized Clinic patients between 5th and 37th pregnant week. Patients was divided on two group: I-st with miscarriage danger, II-nd with premature delivery danger. Bacterial Vaginosis was recognized based into consideration Amsela criterion at 13.4% of examined patients, BV with mycosis coexisted at 3.8%, mycosis infection at 42.2% and trichomoniasis at 4.6% pregnant women. Influence occurred infection of Bacterial Vaginosis on premature delivery coming was also examined. Patients attended towards BV during the pregnant time, which gave preterm birth--21 (47.7%) compared with patients proper vagina ecosystem which also gave preterm labour premature--49 (36.6%). No radical, statistic comparison between those two groups was noticed.