Sayang, pain on one side during pregnancy boleh jadi banyak reasons, ligament stretching, baby position, atau something else, tapi 22 weeks is getting on a bit untuk self-assess je. Pleassse go see your doctor or klinik today, okay? Better safe than sorry. A few of my mum friends also had similar pain during second trimester but doctor cleared them terus, so don't worry lah but do get it checked out!