What were your signs of pre-term labor?

I'm going to call my doctor as soon as I have a window of no students in the library (can't have that doctor convo with 15 kids in earshot)...

But I've been having cramping and diarrhea for 3 days now. I really thought it was something I ate Saturday, but when I was telling my mom about it (no nausea, still hungry, but terrible cramps in my stomach and frequent diarrhea) she said I should be calling my doctor!

But it hasn't gotten worse or more frequent over the 3 days---so probably it's just a weird intestinal bug?