second time moms who've had their babies...

Jo
Hi ladies, 
Second time mom here currently 37 weeks and waiting. I was wondering how different your first labor was compared to your second. I've currently been having menstrual like cramps and the urge to poop. Don't know if it's BH or what? With my first I didn't have BH and didn't start feeling the contractions until I was about 4cms. I would really like your input. 
Thank you!