It doesn't necessarily mean a bad thing but if you are worried go to the e.r. I have sharp pains and I'm 14 weeks but my baby is healthy as can be!! We just had an ultrasound the other day (:
I'm gonna be 16 weeks tomorow. So that's really dangerous right now.
But with any doubt or worries i would go to e.r or l & d.
Depends on how far along you are. Anything from 35 weeks and on it can be a start of labor. Less than 35 weeks it can be preterm labor. But the pain would feel like menstrual cramps and they would come closer and stronger . . .