Fear of MC

How do you get over the fear of MC? This is my first time pregnant and I want this so bad so I’m trying to stay calm through it all, but some nights I just can’t sleep. I was at work and was talking about how I have tender breast and not really any other symptoms. I work in a factory so I’m always on the go doing something and I haven’t eaten a lot that day so I got super lightheaded and a lady at my work proceeded to tell me when that happened to her she ended up miscarrying cause tender breast and low sugar are signs of low progesterone. That’s the first time it happened and I really believe it’s only cause I haven’t got to eat, I haven’t had a problem since but it’s still in the back of my head. How do you know you got low progesterone ? Just in case. Someone please help me ease my mind!