quick sharp pain 26 weeks

I woke up this morning with a few quick stabs of pain.  It's not really painful, but it's not a feeling I've had yet in my abdomen. It's on my upper left side. NOT by the pelvic area.  Baby is still kicking fine and the pain has come and gone.  Is this just the uterus growing? 
I don't want to call the doctor if I'm not in serious pain, just discomfort but wondering if anyone else is feeling this in 26 weeks?