Scared of miscarriage

Ce

We found out on thanksgiving we are expecting baby #2 and we are thrilled. I’m only 4 weeks along. I’m terrified that I’ll have a miscarriage. I haven’t had one before but my mom, grandma, cousin, plenty of female family have all had at least one. I can’t make the fear go away, I don’t want to not be excited but I’m scared to get attached and lose this baby! Is this rational??