Possible preterm labor/mucus plug??

I plan to call my doctor today to see if they can see me. With my daughter she was born at 37 weeks. I have been experiencing Braxton hicks, pressure on my lower stomach, breast pain, and lower back pain. I have been losing discharge for a few days but I know that’s normal. Yesterday I lost what seemed like a good amount of my mucus plug. I’m worried that I might be in the start of preterm labor. I want to see my son but not this soon

. Still plan on getting checked out by my doctor as soon as I can but wanted to know has anyone experienced this?