Eh normal je, first mom! Gerak baby boleh inconsistent pa, especially at 21 weeks lagi awal. Sometimes you feel it more, sometimes kurang, depending on placenta position, activity level, and how tired you are. A few of my mum friends said the same thing masa early pregnancy, they panicked jugak thinking something's wrong, but by 24-25 weeks baru consistent the movements. Kalau you're really worried though, better check with your doctor just to put your mind at ease, especially since you're first time. Jangan stress sangat ye, most likely baby fine je!