How strong are staples?

Im onto day 5 and moving better but I get heaps of anxiety about the wound coming open. Mines quite big (picture in my previous post) and I’ve been told it’s healing well but today I’ve actually been in a lot more pain in the area especially tonight I’m getting this pressure down there and aching which is kind of new. I’ve just been sitting on my side and stomach although I’ve been moving my legs a bit on my side and it feels like it sometimes pulls on it.

Getting out of bed is awkward too.

Has anyone had issues with this and if so what caused it?

Or are staples more resistant than I think and would that mean only a really deep squat or direct pressure or impact would open it up?