Yep.. in helps in cases where woman may have or do have clotting disorders. I think it helps thin out your blood to help blood flow to the embryo.
I just recently started taking a baby aspirin everyday. Helps with fertility/implantation, that's what i read somewhere.
I think Baby aspirin is recommended once you start your cycle after AF so that there will be good amount of blood supply to your ovaries so that they can prepare for ovulation.