Has anyone experienced this? 21 weeks

I woke up yesterday morning with a pain in my side. It’s like an intense pulling on my right side whenever I stand up from laying or sitting. It isn’t a cramp sensation which helps keeps me calm but it is quite painful and I’m not sure what to do. I’ve tried taking a bath, and resting but it still hasn’t went away. I usually sleep in my left hand side so I was thinking maybe my bump is getting heavy enough that it’s straining the muscles on my right side from being pulled in all night? I’m just wondering if anyone else has experienced this, and what it is or what helped?