Is 30 weeks too early for Braxton hicks??

Lina
Help! I need advice. I'm 30 weeks and I feel period like cramps, lower back pain, tight belly and nauseousness all at once. It's in and off so I don't think it's regular contractions... This is my second pregnancy but with my first I was induced so I never experienced this. I also have a watery discharge. Could I be close to labor??