Help for Anxiety?

Estariel
This is my first and its been an interesting journey so far. I am 15 weeks today. I've recently started to have mini panic attacks about not knowing if my baby is okay. The doctor hasn't seen anything abnormal on all of my visits but I'm still worried. I've been looking up the earliest a baby can be born and survive. I'm terrified I won't make it another 9 weeks... I have no facts to gather any of this fear from. What do you do to help calm down when you get worked up?