When I went into labor with my DS2 (at 39wks) I thought I had bad gas/had to poop. It wasn't until a few hours after in and out of the bathroom I realized I was in labor. Now i'm having waves of gas pains/menstrual cramping. It's probably nothing, and that I just need to let out a big fart. But i've had it all morning. I'm certainly not getting my hopes up.

DS - 7.2006 - C-Section b/c Breech
DS2 - 4.2008 - Successful Vbac
DD - 5.2012 - Successful Vbac
Re: I may start timing my gas pains...
I just got done scrubbing my laundry room top to bottom for the past 4 hours while my DS's were in school. I am bumping from my phone while they now eat lunch. When they're done i'm going back to cleaning my house. Then I have to go to work tonight. Rinse. And repeat in the morning. I have plenty to do and keep my mind off of labor. I'm more anxious about it because i'm a vbac2er, and if I don't start showing signs of labor (i.e more dialation and effacement), they will want to induce me shortly after 40 weeks. And an induction for a vbac-er is almost a gauranteed fail, which means a repeat c-section.
DS - 7.2006 - C-Section b/c Breech
DS2 - 4.2008 - Successful Vbac
DD - 5.2012 - Successful Vbac
Oooh, I hope this is it for you too!! Especially since I know you mentioned you weren't feeling anything before! Yay for something!!!