Ay, don't worry mama, 15 weeks pa lang kaya totally normal kung di pa consistent ang movements, a few of us first-timers din nag-panic rito! Usually around 16-20 weeks na talaga makikita mo ng malinaw ang kicks, lalo na if first baby mo, kaya maybe in a few weeks pa lang you'll feel more activity. Pero if you're really anxious about the changes, best to mention it sa OB mo next check-up para ma-ease ang mind mo, okay?