early labor signs

I'm 37 wks +6 days and I've been having irregular contractions for several days that don't seem to be forming any kind of pattern yet. I've also been EXTREMELY fatigued, sleeping 10+ hours a night (with frequent trips to the bathroom) and feeling like I need to poop all the time but usually nothing happens. Last night I started having a lot of pressure in my back and then I woke up at about 5 this morning feeling like I need to vomit. It's now 2:30 in the afternoon and I'm still feeling very under the weather. I'm wondering if I should expect labor to start soon. Has anyone had a similar experience?