This is my 2nd pregnancy and so far it's completely different.  My boobs hurt so bad, and the gas pain is ridiculous.  I also have what feels like twinges of "stretching" pain in my uterus, but it's not very painful (like I wouldn't stop what I was doing or anything), and random back pain (which could be gas).  Is it too early for stretching pain?  I'm 6 weeks.  I got it early with my first but not until 13/14 weeks.