Aiyoh mama, at 15 weeks mmg normal lah rasa macam tu, your ligaments tengah stretch, baby growing, and hormones pun berubah-ubah, so perut akan terasa weird and uncomfortable in so many ways. A few of my mum friends also complained about that exact feeling around that stage, macam ada yang kejap sakit, kejap tight, kejap okay je, it's just your body adjusting. But kalau the pain becomes constant, really severe, atau ada bleeding, better check with your doctor cepat-cepat okay, just to be on the safe side and put your mind at ease