What kinda stress makes miscarriage happened?
There is no way to prove that stress causes a miscarriage. Stress can definitely be a contributing factor, but almost always miscarriages are caused by weaknesses in the pregnancy that already existed – such as genetic malformations, not securely attached, blood clotting disorders, etc. Women have lived in stressful conditions for centuries upon centuries. Slaves, women suffering abuse, women who must perform hard labor to support their families, women who are malnourished, etc. and yet many still carry their pregnancies on to delivery. What many women call “stress” these days (relationship issues, drama, working a desk job for 8 hours a day, etc.) and fear miscarriage from is not much of anything compared to what some women in the world live through during pregnancy. Unfortunately many of these pregnant women lack the perspective to see how minor their stress really is, and that much of it is self-created.