Hey,
I have drove my car for about 2,500 miles locally since i got it 6 months ago.

It has 190,000 miles on it. Thers no stickers on the timing belt cover indicating that it has been changed recently.

How would i know that it needs to be changed?

I am going on a trip this weekend, will it hold up a 3.5 hour drive. (300miles average 70-80mph?)

Or should i get this checked/changed before the trip? Its a strong motor, idles at 1000 rpm pretty smooth.
Please help somone before i hit the road

Probably will be fine. There is no easy way to check it without being at the point of easily changing it.