If you've been diagnosed with placenta previa (where the placenta covers all or part of your cevix), anal sex may cause trauma to the placenta. Getting pregnant through anal sex is unlikely. In theory, it's possible that it could happen if semen from the anus gets into the vagina. With anal sex, sexually. Although there isn't a direct path from the anus/rectum to the there is a small chance that you could become pregnant during anal sex. This is.