Ay, totally understandable na nag-alala ka, lalo na first time mom ka! At 27 weeks, oo, may pattern na talaga sila, usually mas active sila after you eat or drink something cold, or pag gabi when you're resting, kaya minsan parang may schedule na talaga na gising at tulog time. But honestly, if you've noticed na significant change in his movement for 2 days na, like fewer kicks or slower movements compared sa usual niya, better to contact your OB agad, even just para sa peace of mind, kasi important na ma-monitor ang baby movement patterns mo especially this stage ng pregnancy. One of my mum friends said they called their doc for the same concern and it was nothing serious, pero sabi nila worth it ang call para ma-rule out agad, kaya don't hesitate ha!