Pregnant with twins, sharp pain in left side

Patient: Im 33 weeks pregnant with twins and this morning i woke up hurting in my left side above my hip it then progressed to my right side then eventually across my entire lower back. I took a warm bath after dealing with it for about 2 hours and about an hour after my bath it stopped. Now it is starting again.. could this be labor?

Symptoms: Sharp pain in left side

Doctor: