what is the chance?

What is the chances of miscarriage when you are 12 wks along, and constantly stressing out? Tonight my fiancé and I had a big fight due to me finding some stuff on his phone, we live together and I don't even want to be around him. He thinks that me stressing will cause a miscarriage or something bad will happen. Tonight he made threats that if something happens to the baby I'm carrying, he will mess up my life and I'll regret it. I just wonder how much my actions affect the fetus? Thanks in advance! 💗