CHARACTERISTICS AND PREGNANCY OUTCOMES OF IN VITRO FERTILIZATION CASES WITH VAGINAL BLEEDING IN THE FIRST 12 WEEKS. YHCĐ [Internet]. 2026 Apr. 2 [cited 2026 Sept. 8];67(CĐ3-NCKH). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/4714