Ooh at 19 weeks plus, you might be starting to feel baby movements, tapi yang you describe sounds more like the earlier fluttering feelings, some of my mum friends said it felt like butterflies or gelembung air ketika first time they felt it, bukan tendangan proper lagi! The occasional sharp feeling in one spot could be ligament stretching or baby changing position, tapi since you're concerned about it, better check with your doctor to make sure everything's okay, they can confirm if it's normal movement or something else, so you'll feel more at ease. What does the feeling feel like exactly, more like a flutter or like pulling sensation?