Hi Sophy,
I used to do massage so know what you mean. As you can probably tell everyone heals very differently and I image it’s for different reasons.
All I can say is how I’ve been, the first week i was on strong painkillers and couldn’t do anything without real pain all inside the boob and chest muscles, week two I can now do things around the house very gently and the pain is more just surface pain like sore nipples etc. I’m due back next Monday and dreading having to drive as I don’t think I can pull down on the wheel yet.
I’d say three weeks would be perfect and even with doing massage you may end up pushing your body weight into the movements a bit more rather than put all the strain on your under arm chest muscle. You may also be one of the lucky ones and have little or no pain at all.
Hope that’s of some help. Good luck with you op sweetie. Xx