Whoa. I was really startled by the post above which recommends concealing critical information from your midwife (such as the fact that you're carrying twins). The writer said that she wished she had kept her twins a secret so that she could have the home birth she wanted.
I'm very sorry to hear about the negative experience in hospital. However, as a trained midwife myself, I'm also deeply disturbed by the advice to be less than honest with your midwife. After all, the whole point of prenatal care is to help you and your baby have the best outcomes possible. For example, let's say that you'd prefer not to have the shot of erot or oxytocin after the birth, which is usually given to prevent postpartum hemorrhage (PPH). You might want to reconsider this preference if you're carrying twins! Your midwife can provide the information you need to make this decision. But if you don't tell her what's going on, you won't get all the relevant information. Now you're both in the dark. That's a dodgy situation for you and your babies as well as for the midwife.
There are so many other ways in which sharing information can benefit you and your baby... and incidentally, help to keep midwifery available to all women, by making it possible for your midwife to provide competent care. If you have a good relationship with your care provider, you should be able to make a plan that works for both of you. If you don't... well, I'd say it's time to find another care provider.