Wa'alaikumassalam, sayang! Abdominal pain in pregnancy boleh jadi banyak reasons, from ligament stretching to something yang perlu check immediately. Since you're already 22 weeks, please call your doctor or go to the clinic/hospital tonight to get checked out , especially if the pain is sharp, persistent, or ada bleeding. Don't worry yourself too much dulu, but jangan delay jugak, better safe than sorry when it comes to baby, kan? Let me know how it goes!