When I went in to labor with both of my pregnancies I had a strange gassy feeling in the beginning. I remember having it with both of them. I thought both times it must have been something I had eaten. But the gas-like pains quickly turned in to contraction pains and progressed from there. I remember going to the doctor the day I was in labor with my first child. I was having the gas pains all morning and had an appt and the doc told me I was fine and could go home and he would see me in another week. I was at the hospital within a few hours!
And I also had nesting before both of my kids were born. When pregnant with my first I was outside doing yard work in 45 degree weather.
And with my second I went out and bought a huge area rug and some other furnishings to fix up areas in our livingroom and did it all by myself. I had so much energy both times and they were both within 24 hours of when I started to see signs of labor.