almost 21 weeks and terrified!

I keep getting these random waves of anxiety. For some reason I can not stop worrying about stillbirth! I'm trying to enjoy my pregnancy and I know worrying won't change what's meant to happen but I don't know how to just relax! I'm already so in love with my son and I don't know if I could handle something happening. This is my second pregnancy, I was just as worried with my daughter and she's a healthy 4 year old. I was hoping this time around I'd relax a little more and NOTHING is helping. If anyone has any positivity to throw my way, it'd be greatly appreciated. 😓