37 weeks and 4 days with lower pelvic pain

Hey ladies I just started getting a pain the left side of my pelvis on my pubic line and it's really painful, similar to when you have gas. I'm lying in bed and if I try to change position it hurts more . I've had it for about 10 minutes now and it's still there. I'm not sure what to do , I was told last week baby was fully engaged but she's been so active in the last few days so I feel her position had changed several times! Could it just be her getting lower or should I be worried something is wrong? Any advice is welcome. I don't want to have to call the hospital unless I have to!