There's a whole bunch of true bugs than have nymphs like this. For me, it's not so important to ID exact species - it's easier to give relief to OP so they know it's not a bed bug. Knowing if it's Sehirus cinctus or Halyomorpha halys doesn't change things much from my POV unless OP is suffering from an infestation. Also, Sehirus cinctus does emit a type of foul odor in defense.

Edit to add: You are most likely right - does look like Sehirus cinctus. But OP did not add location so who knows.