While some women may experience light spotting during the early stages of pregnancy, bleeding can be a cause for concern, especially if you’re carrying twins. Bleeding during the first week of a twin pregnancy can occur due to a variety of reasons such as implantation bleeding, subchorionic hemorrhage, or infection. It’s important to consult your doctor immediately if you experience any vaginal bleeding or spotting, cramping, or abdominal pain. Keep in mind that not all women experience the same signs of twins or signs that they’re having twins, so it’s best to trust your instincts and seek medical attention if you have any concerns.