Eish, itu memang common during pregnancy, especially around 22 weeks when rahim tengah stretch dan ligaments pulling, a few of my mum friends kena the same thing, mostly fine je. But since it's causing you worry, better check with your gynae just to be sure, especially kalau ada any spotting or if the pain gets worse or lebih frequent; they'll listen to your concerns and do a quick check untuk peace of mind, which is important lah when you're first-time pregnant!