There seem to be a lot of replies regarding nursing but you mention midwifery in your original post, so to give you a perspective on Midwifery it tends to be a more competitive course than some fields of Nursing and entry requirements tend to be more strict (for Nursing, its often just a requirement to have GCSE Maths & English, however most universities for Midwifery will want a Science qualification at GCSE as well.) Although universities will often be accommodating in terms of alternative entry requirements (eg. some universities will accept Functional Skills instead of GCSE), it's unlikely that they will waiver an entire entry requirement especially in a course as competitive as Midwifery.
It helps to contact the uni directly to discuss your situation, and also to speak with your college as well as they may be able to offer you a resit of your GCSE if necessary.