Ftm... 32 weeks sharp pain, left side of abdomen and back? (Tmi)

What could that be? I just started having it for about 30 minutes now and it goes away every 10 minutes. The pain level isn't constant, but my baby loves kicking at that side so it gets pretty uncomfortable. I have been losing my mucous plug for a few days also... and for the past few days my SO hasn't been giving me any, so I recently bought myself a vibrating dildo and was using it when the pain started.... lol