This is so hard

I'm 5+1 with our rainbow after two miscarriages. It may be the hardest thing I've ever done. I can't stop worrying. I worry when I have cramps, I worry when I don't. I worry when my boobs don't hurt as much as they did. I worry that anything I do or eat is going to hurt this baby. I've tried so hard to stay calm knowing there is absolutely nothing I can do to prevent the inevitable, but I always end up getting worked up again. What are some tips that helped you get though pregnancy after a loss?