Labor starting

Katy • Pregnant with my first, baby boy, due December 3rd! My rainbow baby🌈 Married 3 years

I don’t understand how labor starts. I’m 37 weeks and I had period cramps all week but they stopped, lost my mucus plug, 2 cm already, but I don’t get how contractions just start.....just like period cramps but get worse??? Someone explain.

I’m so excited to have my baby and scared so every time I feel something I’m like ahhhh is this the start of labor?!