32 weeks sharp pain

I'm currently 32w 2d and I keep getting these sharp pains in my back that linger around to my  pelvis. They only last 10-15 seconds, but they are so painful it makes me stop doing whatever I'm doing. I've had these pains 4 times in the past hour. I'm not a first time mom but don't remember this ever happening with my first child. Any ideas on how to relieve the pain would be fantastic!