Hi Hun, it’s hard to say as I done what your doing. I bought M&S sports bras in a 32D and 32DD and after surgery none of them fit. Luckily I’d bought the mya bras and they fit me fine but all’s I wore from about 5dpo was my M&S ones once the swelling went down a little.. if your wanting M&S my lucky guess would be to get a 34dd(maybe) Xxx