Quick stabbing pain

Jacinta • Pregnant with my rainbow baby boy ☺️💙👶🏽🌈 due December 27th 2015!
I randomly get this quick stabbing pain in my sides and lower abdomen! Just wondering if anyone has experienced this and what it could be? I'm 34 weeks and 4 days! 1 cm dilated and 75% effaced! Don't know if that has anything to do with it!