Hey Sophie. First of all I absolutely feel your pain, I was itching to get back into training! I went back to the gym 2 weeks post op (now 5 weeks). I only did light cardio (incline walks) and lower body weight training, very light weight high reps and I felt absolutely fine.
If it feels okay I’d say you will be fine to go back just don’t push yourself too hard. I have my 6 week check up next Wednesday and I’m hoping my nurse will give me the go ahead to do upper body!
I’d just steer clear of running or jogging and upper body and make sure you wear a good supportive sports bra and you should be fine x x x