4.5 weeks post op, I slipped after Tummy tuck. Could I have ruined my Tummy tuck?

Unless you felt an actual popping sensation in your tummy, it is unlikely that the sutures that were used to tighten your abdomen have failed.  Feeling swollen and tight is common at this stage, especially after an unexpected strain on your abdominal wall. Really, only time will tell, but I suspect you will be fine.  Best of luck with your continued recovery!

I highly suggest meeting with your surgeon
for an in-person examination. It is unlikely that your slip did any damage,
however you should get checked out just to make sure. Best regards.

Hello, without a proper examination it isn't proper to give you guidance about your abdominal concerns.  For this type of problem I would recommend contacting your physician for a proper assessment.  I hope everything goes well.