Ahhh I understand la, rasa sengat-sengat dalam perut tu memang boleh buat paranoid especially first baby kan, a few of my mum friends felt the same thing during pregnancy, some kena Braxton Hicks (those practice contractions), ada yang just stretching pains sebab uterus growing. But honestly sayang, since you've been feeling it a few times now and it's making you worry, better check with your doctor or midwife just to be safe, at least boleh peace of mind and they can confirm apa yang you're feeling