I would recommend sociology for the subjects you've mentioned, however, if you're considering midwifery it might be more prudent to take either psychology, biology or chemistry. Also, if you want to take law, many universities will want you to have something like English, History or a MFL subject.
I would do some thorough research on what Law and Midwifery require if you're aiming for them, as your current subjects could negatively affect your chances.