Aiyoo, 18 weeks tu memang normal je rasa pulling atau stretching pain macam tu, perut you sedang expand untuk baby, so ligaments kena stretch jugak! Tapi kalau the pain tu sharp, continuous, atau ada bleeding, better cepat check dengan doctor tau, just to be safe. A few of my mum friends experienced the same thing and it went away, but setiap orang beza so best to confirm with your gynae je, tak apa pun.