I'm a new mom and into my third trimester. Lately I have been having cramps at the the top of my stomach. And it usually happens when I'm in the car. I have absolutely no clue where they are coming from
If it's happening when you're sitting in a particular position eg in the car, then I would assume it's just your body responding to feeling a bit squashed.
I've been getting cramps across the top of my belly when I sit slouched at my computer. If I straighten up they go away.
Having said that, if you're concerned it's always a good idea to run it past your health provider.