Hai, at 19 weeks rasa macam cramping or period-like pain memang boleh jadi normal sebab ligaments tengah stretch dan hormones berubah, tapi honestly better check with your doctor just to be safe especially kalau sakit tu consistent or intense, a few of my mum friends had similar feelings and their docs said it was round ligament pain, tapi some cases boleh jadi something else yang kena monitor. Jangan worry, most likely fine je, tapi best peace of mind kalau go to your antenatal visit and mention it kat doctor, okay?