I was advised to take it to help prevent pre-eclampsia. I was nervous and did a lot of research before taking it, but I was happy and did take it as I thought the evidence showed it was a good idea.
You'll sometimes see it referred to as 'baby aspirin'. I believe that's because it's a low dose not because you're having a baby! I took 80mg a day and they were gastro resistant ones so they didn't cause me any tummy problems.