Can crying cause labor/contractions?

I won't go into all the details here other than the family that I married into are some of the worst people I've ever met-- I just had a full on meltdown because of them, I'm talking crying so hard I was gasping. I've just been able to breathe normally and I'm feeling what seems like light contractions. They hurt, but aren't unbearable. Has anyone else experienced anything like this? I'm 38 weeks today.