Is a failed pregnancy a sign of poor health/genetics? If a woman has a stillborn baby, does that imply she has poor physical health or "low quality" genes? Supposing she successfully goes on to have children later, can we infer from the previous failed pregnancy that those children will be more prone to defects/conditions? or that they would be more suceptible to disease?

Has any studies been done on this? Where can I learn more about this topic?