https://gynecological-health.suite101.com/article.cfm/uterine_positions
Never heard of it before but I googled it and it says here:
An anteverted uterus is one in which the uterus is tipped forward toward the front of the abdomen. This is the most common uterine position. Anteflexion occurs when the body and fundus of the uterus flex forward at the cervix. When the uterus points upward, towards the head, it is retroverted. A retroflexed uterus flexes backward at the cervix, the lower part of the uterus, so that the body and fundus point towards the back. The uterus may also tilt more toward the right or left. Anteflexed and retroflexed uteruses will become retroverted as pregnancy progresses, and will likely return to their original position after childbirth.