In short - no. 4 weeks is not enough time for all your tissue etc to knit back together strongly enough. Brisk walking and a bit of gentle cardio vascular is fine, no bending, stretching, lifting, sit-ups tho'. Not a step machine either. Have a go on a cycle or basic aerobic steps like grapevine but not with the circular arm movements or any reaching.
So - gentle movements which increase the heart rate ar ok - upper body which involve stretching the area are not.
That help?