Can stress harm fetus. Or in future?

This is very hard to answer. There has been studies that highlights that a mother in stress has some impact on the foetus. But frank mental illnesses have not been reported consistently in the various studies. What impact it will have on your baby is hard to say now and even later. It can create vulnerabilities for illness but it is not guaranteed that your baby will have an illness in future. There are many factors at play when a mental illness surfaces in a person. Some symptoms are there in every one but it is called mental illness only if there is significant amount of dysfunction in their daily life. If the home environment post delivery is good and supportive and the child is given good balanced care they will most likely grow up to be confident and healthy individuals. So my advise will be to not worry and prepare your self for good parenting. May be read some books about parenting and how to have balanced approach when raising a child. Have a nice day.