haha you have some funny ideas

what is "十个月小孩质量特别好"? is it because "我那时怀孕时候,就没有工作了"? and "她们一面上班,IT JOG,有两个都在三个月前流掉了" because of work?

do you know early stage miscarrige (三个月前流掉) has the following major cause:

chromosomal abnormalities

collagen vascular disease

diabetes

other hormonal problems

infection

and congenital (present at birth) abnormalities of the uterus

do you find working or jogging in the above list?

in other words, your friends would have had the miscarriages anyway even though they were not working or jogging, and you wouldn't have had the miscarriage even though you did work.

i had an impression you were from the medical field, but it seems you don't have the basic knowledge about pregnancy. maybe your knowledge is in different field in medicine.