Yeh give the midwives a go but i found it the other way around when i was asking while i was pregnant. The midwives didnt seem to want a bar of it but we went to our local GP (as youll need a referral anyways) and he pulled out his book and gave us 2 names in the area and was totally fine about it. I do know in my area, they wont book you in unforunately until the baby is born, i guess being incase its not actually a boy and you forget to cancel your appointment.