Sayang, this is something you really need to check with your doctor ASAP, jangan tunggu! Some mums feel movements earlier, some later, tapi at 20 weeks it's worth getting checked out properly to make sure baby's doing okay. Don't worry yourself alone, go see your gynae, okay? They'll do an ultrasound and give you peace of mind. A few of my mum friends also felt gerakan a bit later than expected, but the doctor visit is what matters. Take care!