Can a girl get pregnant from touching an object that has or had sperm on it? and later masturbates minutes to an hour later after touchin the object

Very doubtful: I would guess that the odd's of this resulting in pregnancy would be astronomically low.

Unlikely to happen: It does only take one to do the job.However, to do that job the sperm needs to be in a location that preserves their ability to function.That includes remaining moist and having access to the internal genitalia.The girl must have an egg in the proper position to be fertilized.All those requirements make it quite unlikely. But take more care in the future.