I would recommend going up a back size for swelling, mine dug in and sometimes I had to undo it for relief and I did go up a back size. Would thoroughly recommend a macom as it will adjust with you(buy normal band size). I went through so many sizes/sports bras in the first few weeks as they changed so much. I ended up buying one and still wear it now to sleep in. You get a 15% discount with the code mybreast and if you have two of them you will be sorted. I only bought sports bras again once they were settled. Am 15 weeks post op and they are now a 32ff but have worn a 32d/dd/e/f throughout my journey 🙂 xxx