Suddenly scared

I’m pregnant with my 2nd and for some reason I’m really nervous and scared. I’m scared it’s not going to turn out well. I’m terrified of being pregnant again and that I’m going to die and my daughter will grow up without a mother. Is this a common fear? Any advice on how to get over it? I’m high risk because of health issues I have and that makes my baby high risk as well. Part of me regrets wanting another kid because I don’t want to leave my husband and daughter behind. I should’ve just been grateful with one! I would never do anything to harm this baby but I’m nervous for my family and myself.