Another hernia 4 weeks after repair?

Depends on how your hernia was surveyed laparoscopically.
Some hernias are filled with fat and a survey from the inside will not reveal a hole (aka a TAPP or transabdominal laparoscopic survey) while there really is a hole/hernia.
If your surgeon took down that fat and actually looked at the muscle to see if there is a hole (aka TEP or extra peritoneal laparoscopic survey) then there is no better more sure way of ruling out a hernia.