First pregnancy& feeling scared!

I'm constantly stressing which I know isn't good for the baby but I've been cramping for about 2 weeks now. I thought I was 8 weeks because of my LMP but turns out my cycles are super long and I'm probably around 4-5 weeks now. Every cramp I experience I think the worst. I'm sure I'm just over thinking& freaking out for now reason but does anyone have any advice to clam these thoughts?