Jangan worry, 15 weeks is still early, a lot of first-time mums don't feel anything yet! Usually quickening starts around 16-20 weeks depending on where your placenta is (if it's in front, you'll feel later), and honestly a few of my mum friends said they only noticed around 18-19 weeks. The first movements are super subtle, like bubbles or butterflies, so sometimes we miss them if we're busy, try lying down quiet-quiet in the evening and you might catch something, but if nothing yet memang normal je. Do mention it to your doctor at your next checkup just to be reassured, but seriously don't stress yourself lah