Tummy Tuck NOT Yet Completely Healed
Unfortunately, you are not quite out of the woods yet. Three and a half weeks is certainly pretty good, but wounds can come apart of "dehisce" even at a late stage, so I wouldn't necessarily bank on scar being durable yet. Of course, with every passing day, you get a little more healed, but I wouldn't go doing any back bends just now - if you know what I mean. At six weeks I would certainly feel better about it, but in the world of surgery, many strange things are possible - so even then I would take it easy.
Not sure about the tape because I don't use it in my practice. I would check with your surgeon.
How strong is my tummy tuck incision 3.5 weeks after surgery
At 2 weeks, your incision has 70% of its final strength. At 6 weeks, it has 90% of its final strength.
Irritation or significant trauma can pull apart a healing would, but the closer to 6 weeks, the harder it is.
The small openings in your incision suggest suture reactions. Have your surgeon check these and ask him about the tape on your incisions. In the post-operative period, your best advice is from your surgeon.
Make an appointment with your plastic surgeon's office right away. They need to hear about any discomfort or unusual healing immediately.